diff --git a/initenv.lua b/initenv.lua
index 05ad4f6..035d84e 100644
--- a/initenv.lua
+++ b/initenv.lua
@@ -2,9 +2,7 @@ return {
 -- initialize booted environment
 init_env = function ()
     local _require, _env = require("cc.require"), setmetatable({}, { __index = _ENV })
-    -- overwrite require/package globals
     require, package = _require.make(_env, "/")
-    -- reset terminal
     term.clear(); term.setCursorPos(1, 1)
 end
 }
diff --git a/rtu/configure.lua b/rtu/configure.lua
index 296c91c..3c8a621 100644
--- a/rtu/configure.lua
+++ b/rtu/configure.lua
@@ -698,6 +698,7 @@ local function config_view(display)
             tool_ctl.p_idx.set_max(2)
             tool_ctl.p_unit.reposition(44, 4)
             tool_ctl.p_unit.enable()
+            tool_ctl.p_unit.show()
             tool_ctl.p_assign_btn.hide(true)
             tool_ctl.p_assign_end.hide(true)
             tool_ctl.p_desc.reposition(1, 7)
@@ -710,6 +711,7 @@ local function config_view(display)
             tool_ctl.p_idx.set_max(3)
             tool_ctl.p_unit.reposition(45, 4)
             tool_ctl.p_unit.enable()
+            tool_ctl.p_unit.show()
             tool_ctl.p_assign_btn.hide(true)
             tool_ctl.p_assign_end.hide(true)
             tool_ctl.p_desc.reposition(1, 7)
@@ -719,6 +721,7 @@ local function config_view(display)
             tool_ctl.p_prompt.set_value("This SNA is for reactor unit #    .")
             tool_ctl.p_unit.reposition(31, 4)
             tool_ctl.p_unit.enable()
+            tool_ctl.p_unit.show()
             tool_ctl.p_assign_btn.hide(true)
             tool_ctl.p_assign_end.hide(true)
             tool_ctl.p_desc_ext.set_value("Before adding lots of SNAs: multiply the \"PEAK\" rate on the flow monitor (after connecting at least 1 SNA) by 10 to get the mB/t of waste that they can process. Enough SNAs to provide 2x to 3x of your max burn rate should be a good margin to catch up after night or cloudy weather. Too many devices (such as SNAs) on one RTU can cause lag.")
@@ -732,6 +735,8 @@ local function config_view(display)
             tool_ctl.p_idx.redraw()
             tool_ctl.p_idx.set_max(4)
             tool_ctl.p_unit.reposition(18, 6)
+            tool_ctl.p_unit.enable()
+            tool_ctl.p_unit.show()
 
             if tool_ctl.p_assign_btn.get_value() == 1 then
                 tool_ctl.p_idx.enable()
@@ -754,6 +759,8 @@ local function config_view(display)
             tool_ctl.p_idx.redraw()
             tool_ctl.p_idx.set_max(99)
             tool_ctl.p_unit.reposition(18, 6)
+            tool_ctl.p_unit.enable()
+            tool_ctl.p_unit.show()
             if tool_ctl.p_assign_btn.get_value() == 1 then tool_ctl.p_unit.disable() else tool_ctl.p_unit.enable() end
             tool_ctl.p_desc.reposition(1, 8)
             tool_ctl.p_desc.set_value("You can connect more than one environment detector for a particular unit or the facility. In that case, the maximum radiation reading from those assigned to that particular unit or the facility will be used for alarms and display.")
diff --git a/rtu/startup.lua b/rtu/startup.lua
index 759363a..10c2169 100644
--- a/rtu/startup.lua
+++ b/rtu/startup.lua
@@ -31,7 +31,7 @@ local sna_rtu      = require("rtu.dev.sna_rtu")
 local sps_rtu      = require("rtu.dev.sps_rtu")
 local turbinev_rtu = require("rtu.dev.turbinev_rtu")
 
-local RTU_VERSION = "v1.7.3"
+local RTU_VERSION = "v1.7.4"
 
 local RTU_UNIT_TYPE = types.RTU_UNIT_TYPE
 local RTU_UNIT_HW_STATE = databus.RTU_UNIT_HW_STATE
diff --git a/scada-common/util.lua b/scada-common/util.lua
index 8257a2d..d386bd3 100644
--- a/scada-common/util.lua
+++ b/scada-common/util.lua
@@ -16,13 +16,13 @@ local type = type
 
 local t_concat = table.concat
 local t_insert = table.insert
-local t_unpack = table.unpack
+local t_pack   = table.pack
 
 ---@class util
 local util = {}
 
 -- scada-common version
-util.version = "1.1.9"
+util.version = "1.1.10"
 
 util.TICK_TIME_S = 0.05
 util.TICK_TIME_MS = 50
@@ -104,17 +104,13 @@ end
 ---@return table lines
 function util.strwrap(str, limit) return cc_strings.wrap(str, limit) end
 
--- luacheck: no unused args
-
 -- concatenation with built-in to string
 ---@nodiscard
 ---@vararg any
 ---@return string
----@diagnostic disable-next-line: unused-vararg
 function util.concat(...)
-    local strings = {}
----@diagnostic disable-next-line: undefined-field
-    for i = 1, arg.n do strings[i] = util.strval(arg[i]) end
+    local args, strings = t_pack(...), {}
+    for i = 1, args.n do strings[i] = util.strval(args[i]) end
     return t_concat(strings)
 end
 
@@ -125,10 +121,7 @@ util.c = util.concat
 ---@nodiscard
 ---@param format string
 ---@vararg any
----@diagnostic disable-next-line: unused-vararg
-function util.sprintf(format, ...) return string.format(format, t_unpack(arg)) end
-
--- luacheck: unused args
+function util.sprintf(format, ...) return string.format(format, ...) end
 
 -- format a number string with commas as the thousands separator<br>
 -- subtracts from spaces at the start if present for each comma used