diff --git a/graphics/core.lua b/graphics/core.lua
index 2f17d98..062bf60 100644
--- a/graphics/core.lua
+++ b/graphics/core.lua
@@ -115,8 +115,7 @@ end
 
 -- extract the custom element assert message, dropping the path to the element file
 function core.extract_assert_msg(msg)
-    local start = (string.find(msg, "@") + 1) or 1
-    return string.sub(msg, start)
+    return string.sub(msg, (string.find(msg, "@") + 1) or 1)
 end
 
 -- Interactive Field Manager
@@ -163,11 +162,8 @@ function core.new_ifield(e, max_len, fg_bg, dis_fg_bg)
     function public.censor(censor)
         if type(censor) == "string" and string.len(censor) == 1 then
             self.censor = censor
-            public.show()
-        else
-            self.censor = nil
-            public.show()
-        end
+        else self.censor = nil end
+        public.show()
     end
 
     -- show the field
diff --git a/graphics/element.lua b/graphics/element.lua
index 2ace4e1..41e4c57 100644
--- a/graphics/element.lua
+++ b/graphics/element.lua
@@ -315,8 +315,8 @@ function element.new(args, child_offset_x, child_offset_y)
     -- defocus this element
     function protected.defocus() public.unfocus_all() end
 
-    -- request focus management to focus this element
-    function protected.req_focus() args.parent.__focus_child(public) end
+    -- focus this element and take away focus from all other elements
+    function protected.take_focus() args.parent.__focus_child(public) end
 
     -- action handlers --
 
@@ -426,7 +426,7 @@ function element.new(args, child_offset_x, child_offset_y)
         self.id = args.id or "__ROOT__"
         protected.prepare_template(0, 0, 1)
     else
-        self.id, self.ordinal = args.parent.__add_child(args.id, protected)
+        self.id = args.parent.__add_child(args.id, protected)
     end
 
     ----------------------
diff --git a/graphics/elements/controls/app.lua b/graphics/elements/controls/app.lua
index 1433193..f610393 100644
--- a/graphics/elements/controls/app.lua
+++ b/graphics/elements/controls/app.lua
@@ -118,11 +118,8 @@ local function app_button(args)
 
     -- element redraw
     function e.redraw()
-        -- write app title, centered
         e.w_set_cur(math.floor((e.frame.w - string.len(args.title)) / 2) + 1, 4)
         e.w_write(args.title)
-
-        -- draw button
         draw()
     end
 
diff --git a/graphics/elements/controls/radio_2d.lua b/graphics/elements/controls/radio_2d.lua
index fde886f..65d4c09 100644
--- a/graphics/elements/controls/radio_2d.lua
+++ b/graphics/elements/controls/radio_2d.lua
@@ -188,11 +188,9 @@ local function radio_2d_button(args)
         end
     end
 
-    -- handle focus
+    -- handle focus & enable
     e.on_focused = e.redraw
     e.on_unfocused = e.redraw
-
-    -- handle enable
     e.on_enabled = e.redraw
     e.on_disabled = e.redraw
 
diff --git a/graphics/elements/controls/radio_button.lua b/graphics/elements/controls/radio_button.lua
index 93540f3..aee7060 100644
--- a/graphics/elements/controls/radio_button.lua
+++ b/graphics/elements/controls/radio_button.lua
@@ -132,11 +132,9 @@ local function radio_button(args)
         end
     end
 
-    -- handle focus
+    -- handle focus & enable
     e.on_focused = e.redraw
     e.on_unfocused = e.redraw
-
-    -- handle enable
     e.on_enabled = e.redraw
     e.on_disabled = e.redraw
 
diff --git a/graphics/elements/form/number_field.lua b/graphics/elements/form/number_field.lua
index b519c8a..53fc473 100644
--- a/graphics/elements/form/number_field.lua
+++ b/graphics/elements/form/number_field.lua
@@ -48,7 +48,7 @@ local function number_field(args)
         -- only handle if on an increment or decrement arrow
         if e.enabled then
             if core.events.was_clicked(event.type) then
-                e.req_focus()
+                e.take_focus()
 
                 if event.type == MOUSE_CLICK.UP then
                     ifield.move_cursor(event.current.x)
diff --git a/graphics/elements/form/text_field.lua b/graphics/elements/form/text_field.lua
index 5fc1062..aee910d 100644
--- a/graphics/elements/form/text_field.lua
+++ b/graphics/elements/form/text_field.lua
@@ -43,7 +43,7 @@ local function text_field(args)
         -- only handle if on an increment or decrement arrow
         if e.enabled then
             if core.events.was_clicked(event.type) then
-                e.req_focus()
+                e.take_focus()
 
                 if event.type == MOUSE_CLICK.UP then
                     ifield.move_cursor(event.current.x)
diff --git a/graphics/elements/indicators/power.lua b/graphics/elements/indicators/power.lua
index 96cbfd5..69e4a0b 100644
--- a/graphics/elements/indicators/power.lua
+++ b/graphics/elements/indicators/power.lua
@@ -23,7 +23,7 @@ local element = require("graphics.element")
 ---@param args power_indicator_args
 ---@return graphics_element element, element_id id
 local function power(args)
-    element.assert(type(args.value) == "number", "value is a required number field")
+    element.assert(type(args.value) == "number", "value is a required field")
     element.assert(util.is_int(args.width), "width is a required field")
 
     args.height = 1
diff --git a/graphics/elements/indicators/rad.lua b/graphics/elements/indicators/rad.lua
index d13655e..545ea41 100644
--- a/graphics/elements/indicators/rad.lua
+++ b/graphics/elements/indicators/rad.lua
@@ -33,7 +33,7 @@ local function rad(args)
     -- create new graphics element base object
     local e = element.new(args)
 
-    e.value = types.new_zero_radiation_reading()
+    e.value = args.value or types.new_zero_radiation_reading()
 
     local label_len = string.len(args.label)
     local data_start = 1
diff --git a/graphics/elements/listbox.lua b/graphics/elements/listbox.lua
index a35330a..d138e19 100644
--- a/graphics/elements/listbox.lua
+++ b/graphics/elements/listbox.lua
@@ -278,12 +278,6 @@ local function listbox(args)
     function e.redraw()
         draw_arrows(0)
         draw_bar()
-
-        -- redraw all children
-        for i = 1, #list do
-            local item = list[i]    ---@type listbox_item
-            item.e.redraw()
-        end
     end
 
     -- initial draw
diff --git a/pocket/startup.lua b/pocket/startup.lua
index 68fb2c1..4929955 100644
--- a/pocket/startup.lua
+++ b/pocket/startup.lua
@@ -170,7 +170,7 @@ local function main()
                 -- got a packet
                 local packet = pocket_comms.parse_packet(param1, param2, param3, param4, param5)
                 pocket_comms.handle_packet(packet)
-            elseif event == "mouse_click" or event == "mouse_up" or event == "mouse_drag" or event == "mouse_scroll"or
+            elseif event == "mouse_click" or event == "mouse_up" or event == "mouse_drag" or event == "mouse_scroll" or
                    event == "double_click" then
                 -- handle a monitor touch event
                 renderer.handle_mouse(core.events.new_mouse_event(event, param1, param2, param3))
diff --git a/reactor-plc/config.lua b/reactor-plc/config.lua
deleted file mode 100644
index 066ccf6..0000000
--- a/reactor-plc/config.lua
+++ /dev/null
@@ -1,34 +0,0 @@
-local config = {}
-
--- set to false to run in offline mode (safety regulation only)
-config.NETWORKED = true
--- unique reactor ID
-config.REACTOR_ID = 1
-
--- for offline mode, this redstone interface will turn off (open a valve)
--- when emergency coolant is needed due to low coolant
--- config.EMERGENCY_COOL = { side = "right", color = nil }
-
--- supervisor comms channel
-config.SVR_CHANNEL = 16240
--- PLC comms channel
-config.PLC_CHANNEL = 16241
--- max trusted modem message distance (0 to disable check)
-config.TRUSTED_RANGE = 0
--- time in seconds (>= 2) before assuming a remote device is no longer active
-config.COMMS_TIMEOUT = 5
--- facility authentication key (do NOT use one of your passwords)
--- this enables verifying that messages are authentic
--- all devices on the same network must use the same key
--- config.AUTH_KEY = "SCADAfacility123"
-
--- log path
-config.LOG_PATH = "/log.txt"
--- log mode
---  0 = APPEND (adds to existing file on start)
---  1 = NEW (replaces existing file on start)
-config.LOG_MODE = 0
--- true to log verbose debug messages
-config.LOG_DEBUG = false
-
-return config
diff --git a/reactor-plc/configure.lua b/reactor-plc/configure.lua
index 1373a08..c1b0481 100644
--- a/reactor-plc/configure.lua
+++ b/reactor-plc/configure.lua
@@ -16,8 +16,8 @@ local TextBox     = require("graphics.elements.textbox")
 
 local CheckBox    = require("graphics.elements.controls.checkbox")
 local PushButton  = require("graphics.elements.controls.push_button")
-local RadioButton = require("graphics.elements.controls.radio_button")
 local Radio2D     = require("graphics.elements.controls.radio_2d")
+local RadioButton = require("graphics.elements.controls.radio_button")
 
 local NumberField = require("graphics.elements.form.number_field")
 local TextField   = require("graphics.elements.form.text_field")
@@ -68,7 +68,12 @@ local tool_ctl = {
     bundled_emcool = nil,   ---@type function
     gen_summary = nil,      ---@type function
     show_current_cfg = nil, ---@type function
-    load_legacy = nil       ---@type function
+    load_legacy = nil,      ---@type function
+
+    show_auth_key = nil,    ---@type function
+    show_key_btn = nil,     ---@type graphics_element
+    auth_key_textbox = nil, ---@type graphics_element
+    auth_key_value = ""
 }
 
 ---@class plc_config
@@ -160,7 +165,7 @@ local function load_settings(target)
     target.ConnTimeout = settings.get("ConnTimeout", 5)
     target.TrustedRange = settings.get("TrustedRange", 0)
     target.AuthKey = settings.get("AuthKey", "")
-    target.LogMode = settings.get("LogMode", 0)
+    target.LogMode = settings.get("LogMode", log.MODE.APPEND)
     target.LogPath = settings.get("LogPath", "/log.txt")
     target.LogDebug = settings.get("LogDebug", false)
 end
@@ -171,10 +176,8 @@ local function config_view(display)
     local nav_fg_bg = cpair(colors.black,colors.white)
     local btn_act_fg_bg = cpair(colors.white,colors.gray)
 
-    local function exit()
 ---@diagnostic disable-next-line: undefined-field
-        os.queueEvent("terminate")
-    end
+    local function exit() os.queueEvent("terminate") end
 
     TextBox{parent=display,y=1,text="Reactor PLC Configurator",alignment=CENTER,height=1,fg_bg=style.header}
 
@@ -289,7 +292,7 @@ local function config_view(display)
 
     local function submit_emcool()
         tmp_cfg.EmerCoolSide = side_options_map[side.get_value()]
-        tmp_cfg.EmerCoolColor = util.trinary(bundled.get_value(), color_options_map[color.get_value()], nil)
+        tmp_cfg.EmerCoolColor = color_options_map[color.get_value()]
         next_from_plc()
     end
 
@@ -307,7 +310,7 @@ local function config_view(display)
     TextBox{parent=net_cfg,x=1,y=2,height=1,text_align=CENTER,text=" Network Configuration",fg_bg=cpair(colors.black,colors.lightBlue)}
 
     TextBox{parent=net_c_1,x=1,y=1,height=1,text_align=CENTER,text="Please set the network channels below."}
-    TextBox{parent=net_c_1,x=1,y=3,height=4,text_align=CENTER,text="Each of the 5 uniquely named channels must be the same for each device in this SCADA network. For multiplayer servers, it is recommended to not use the default channels.",fg_bg=cpair(colors.gray,colors.lightGray)}
+    TextBox{parent=net_c_1,x=1,y=3,height=4,text_align=CENTER,text="Each of the 5 uniquely named channels, including the 2 below, must be the same for each device in this SCADA network. For multiplayer servers, it is recommended to not use the default channels.",fg_bg=cpair(colors.gray,colors.lightGray)}
 
     TextBox{parent=net_c_1,x=1,y=8,height=1,text_align=CENTER,text="Supervisor Channel"}
     local svr_chan = NumberField{parent=net_c_1,x=1,y=9,width=7,default=ini_cfg.SVR_Channel,min=1,max=65535,fg_bg=cpair(colors.black,colors.white)}
@@ -464,22 +467,22 @@ local function config_view(display)
         for k, v in pairs(tmp_cfg) do settings.set(k, v) end
 
         if settings.save("reactor-plc.settings") then
-            load_settings(tmp_cfg)
+            load_settings(ini_cfg)
 
-            try_set(networked, tmp_cfg.Networked)
-            try_set(u_id, tmp_cfg.UnitID)
-            try_set(en_em_cool, tmp_cfg.EmerCoolEnable)
-            try_set(side, side_to_idx(tmp_cfg.EmerCoolSide))
-            try_set(bundled, tmp_cfg.EmerCoolColor ~= nil)
-            if tmp_cfg.EmerCoolColor ~= nil then try_set(color, color_to_idx(tmp_cfg.EmerCoolColor)) end
-            try_set(svr_chan, tmp_cfg.SVR_Channel)
-            try_set(plc_chan, tmp_cfg.PLC_Channel)
-            try_set(timeout, tmp_cfg.ConnTimeout)
-            try_set(range, tmp_cfg.TrustedRange)
-            try_set(key, tmp_cfg.AuthKey)
-            try_set(mode, tmp_cfg.LogMode)
-            try_set(path, tmp_cfg.LogPath)
-            try_set(en_dbg, tmp_cfg.LogDebug)
+            try_set(networked, ini_cfg.Networked)
+            try_set(u_id, ini_cfg.UnitID)
+            try_set(en_em_cool, ini_cfg.EmerCoolEnable)
+            try_set(side, side_to_idx(ini_cfg.EmerCoolSide))
+            try_set(bundled, ini_cfg.EmerCoolColor ~= nil)
+            if ini_cfg.EmerCoolColor ~= nil then try_set(color, color_to_idx(ini_cfg.EmerCoolColor)) end
+            try_set(svr_chan, ini_cfg.SVR_Channel)
+            try_set(plc_chan, ini_cfg.PLC_Channel)
+            try_set(timeout, ini_cfg.ConnTimeout)
+            try_set(range, ini_cfg.TrustedRange)
+            try_set(key, ini_cfg.AuthKey)
+            try_set(mode, ini_cfg.LogMode)
+            try_set(path, ini_cfg.LogPath)
+            try_set(en_dbg, ini_cfg.LogDebug)
 
             if tool_ctl.importing_legacy then
                 tool_ctl.importing_legacy = false
@@ -493,6 +496,7 @@ local function config_view(display)
     end
 
     PushButton{parent=sum_c_1,x=1,y=14,min_width=6,text="\x1b Back",callback=back_from_settings,fg_bg=nav_fg_bg,active_fg_bg=btn_act_fg_bg}
+    tool_ctl.show_key_btn = PushButton{parent=sum_c_1,x=8,y=14,min_width=17,text="Unhide Auth Key",callback=function()tool_ctl.show_auth_key()end,fg_bg=nav_fg_bg,active_fg_bg=btn_act_fg_bg,dis_fg_bg=cpair(colors.lightGray,colors.white)}
     tool_ctl.settings_apply = PushButton{parent=sum_c_1,x=43,y=14,min_width=7,text="Apply",callback=save_and_continue,fg_bg=cpair(colors.black,colors.green),active_fg_bg=btn_act_fg_bg}
 
     TextBox{parent=sum_c_2,x=1,y=1,height=1,text_align=CENTER,text="Settings saved!"}
@@ -554,7 +558,7 @@ local function config_view(display)
         tmp_cfg.AuthKey = config.AUTH_KEY or ""
         tmp_cfg.LogMode = config.LOG_MODE
         tmp_cfg.LogPath = config.LOG_PATH
-        tmp_cfg.LogDebug = config.LOG_DEBUG
+        tmp_cfg.LogDebug = config.LOG_DEBUG or false
 
         tool_ctl.gen_summary(tmp_cfg)
         sum_pane.set_value(1)
@@ -562,6 +566,12 @@ local function config_view(display)
         tool_ctl.importing_legacy = true
     end
 
+    -- expose the auth key on the summary page
+    function tool_ctl.show_auth_key()
+        tool_ctl.show_key_btn.disable()
+        tool_ctl.auth_key_textbox.set_value(tool_ctl.auth_key_value)
+    end
+
     -- generate the summary list
     ---@param cfg plc_config
     function tool_ctl.gen_summary(cfg)
@@ -570,6 +580,9 @@ local function config_view(display)
         local alternate = false
         local inner_width = setting_list.get_width() - 1
 
+        tool_ctl.show_key_btn.enable()
+        tool_ctl.auth_key_value = cfg.AuthKey or "" -- to show auth key
+
         for i = 1, #fields do
             local f = fields[i]
             local height = 1
@@ -578,7 +591,7 @@ local function config_view(display)
             local raw = cfg[f[1]]
             local val = util.strval(raw)
 
-            if f[1] == "AuthKey" and hide_key.get_value() then val = string.rep("*", string.len(val)) end
+            if f[1] == "AuthKey" then val = string.rep("*", string.len(val)) end
             if f[1] == "LogMode" then val = util.trinary(raw == log.MODE.APPEND, "append", "replace") end
             if f[1] == "EmerCoolColor" and raw ~= nil then val = color_name_map[raw] end
             if val == "nil" then val = "n/a" end
@@ -594,11 +607,14 @@ local function config_view(display)
             local line = Div{parent=setting_list,height=height,fg_bg=c}
             TextBox{parent=line,text=f[2],width=string.len(f[2]),fg_bg=cpair(colors.black,line.get_fg_bg().bkg)}
 
+            local textbox
             if height > 1 then
-                TextBox{parent=line,x=1,y=2,text=val,height=height-1,alignment=LEFT}
+                textbox = TextBox{parent=line,x=1,y=2,text=val,height=height-1,alignment=LEFT}
             else
-                TextBox{parent=line,x=label_w+1,y=1,text=val,alignment=RIGHT}
+                textbox = TextBox{parent=line,x=label_w+1,y=1,text=val,alignment=RIGHT}
             end
+
+            if f[1] == "AuthKey" then tool_ctl.auth_key_textbox = textbox end
         end
     end
 end
@@ -627,7 +643,6 @@ function configurator.configure(ask_config)
     end
 
     local status, error = pcall(function ()
-        -- init front panel view
         local display = DisplayBox{window=term.current(),fg_bg=style.root}
         config_view(display)
 
diff --git a/reactor-plc/plc.lua b/reactor-plc/plc.lua
index 0942bdc..02d7c3d 100644
--- a/reactor-plc/plc.lua
+++ b/reactor-plc/plc.lua
@@ -33,7 +33,7 @@ plc.config = config
 
 -- load the PLC configuration
 function plc.load_config()
-    assert(settings.load("/reactor-plc.settings"), "failed to load settings file, please reconfigure.")
+    if not settings.load("/reactor-plc.settings") then return false end
 
     config.Networked = settings.get("Networked")
     config.UnitID = settings.get("UnitID")
@@ -59,6 +59,7 @@ function plc.load_config()
     cfv.assert_type_int(config.ConnTimeout)
     cfv.assert_min(config.ConnTimeout, 2)
     cfv.assert_type_num(config.TrustedRange)
+    cfv.assert_min(config.TrustedRange, 0)
     cfv.assert_type_str(config.AuthKey)
     cfv.assert_type_int(config.LogMode)
     cfv.assert_type_str(config.LogPath)
diff --git a/reactor-plc/startup.lua b/reactor-plc/startup.lua
index 300fd16..7ad0d27 100644
--- a/reactor-plc/startup.lua
+++ b/reactor-plc/startup.lua
@@ -106,10 +106,10 @@ local function main()
 
         -- system objects
         plc_sys = {
-            rps = nil,         ---@type rps
-            nic = nil,         ---@type nic
-            plc_comms = nil,   ---@type plc_comms
-            conn_watchdog = nil---@type watchdog
+            rps = nil,          ---@type rps
+            nic = nil,          ---@type nic
+            plc_comms = nil,    ---@type plc_comms
+            conn_watchdog = nil ---@type watchdog
         },
 
         -- message queues
diff --git a/reactor-plc/threads.lua b/reactor-plc/threads.lua
index ccbc196..6699ea3 100644
--- a/reactor-plc/threads.lua
+++ b/reactor-plc/threads.lua
@@ -265,7 +265,7 @@ function threads.thread__main(smem, init)
 
                 -- update indicators
                 databus.tx_hw_status(plc_state)
-            elseif event == "mouse_click" or event == "mouse_up" or event == "mouse_drag" or event == "mouse_scroll"or
+            elseif event == "mouse_click" or event == "mouse_up" or event == "mouse_drag" or event == "mouse_scroll" or
                    event == "double_click" then
                 -- handle a mouse event
                 renderer.handle_mouse(core.events.new_mouse_event(event, param1, param2, param3))
diff --git a/rtu/threads.lua b/rtu/threads.lua
index 29e54cf..d76d062 100644
--- a/rtu/threads.lua
+++ b/rtu/threads.lua
@@ -279,7 +279,7 @@ function threads.thread__main(smem)
                         end
                     end
                 end
-            elseif event == "mouse_click" or event == "mouse_up" or event == "mouse_drag" or event == "mouse_scroll"or
+            elseif event == "mouse_click" or event == "mouse_up" or event == "mouse_drag" or event == "mouse_scroll" or
                    event == "double_click" then
                 -- handle a mouse event
                 renderer.handle_mouse(core.events.new_mouse_event(event, param1, param2, param3))
diff --git a/supervisor/startup.lua b/supervisor/startup.lua
index 11f0948..76fd746 100644
--- a/supervisor/startup.lua
+++ b/supervisor/startup.lua
@@ -213,7 +213,7 @@ local function main()
             -- got a packet
             local packet = superv_comms.parse_packet(param1, param2, param3, param4, param5)
             superv_comms.handle_packet(packet)
-        elseif event == "mouse_click" or event == "mouse_up" or event == "mouse_drag" or event == "mouse_scroll"or
+        elseif event == "mouse_click" or event == "mouse_up" or event == "mouse_drag" or event == "mouse_scroll" or
                event == "double_click" then
             -- handle a mouse event
             renderer.handle_mouse(core.events.new_mouse_event(event, param1, param2, param3))