Here is what is referenced in my console file for AMMS for the issue previously described in the mod's main comment section. Please note I only have the base mod enabled and all obsolete sub mods are disabled.

New update bugged my map. Symbols previously used are now simple blocks in the color they were placed, and can't be removed because the option was pushed off screen by the large amount added.

New UI doesn't work for me on existing save. it shows up, but buttons don't function.

LOG : General , 1693354506651> -----------------------------------------
STACK TRACE
-----------------------------------------
function: self -- file: AddMoreMapSymbolsUIEdit.lua line # 291 | MOD: Add More Map Symbols (AMMS)
function: onMouseUp -- file: ISButton.lua line # 56 | Vanilla

ERROR: General , 1693354506651> ExceptionLogger.logException> Exception thrown java.lang.RuntimeException: attempted index: null of non-table: null at KahluaThread.tableget line:1689.
ERROR: General , 1693354506651> DebugLogStream.printException> Stack trace:
java.lang.RuntimeException: attempted index: null of non-table: null
at se.krka.kahlua.vm.KahluaThread.tableget(KahluaThread.java:1689)
at se.krka.kahlua.vm.KahluaThread.luaMainloop(KahluaThread.java:492)
at se.krka.kahlua.vm.KahluaThread.call(KahluaThread.java:163)
at se.krka.kahlua.vm.KahluaThread.pcall(KahluaThread.java:1980)
at se.krka.kahlua.vm.KahluaThread.pcallBoolean(KahluaThread.java:1924)
at se.krka.kahlua.integration.LuaCaller.protectedCallBoolean(LuaCaller.java:104)
at zombie.ui.UIElement.onMouseUp(UIElement.java:1228)
at zombie.ui.UIElement.onMouseUp(UIElement.java:1183)
at zombie.ui.UIElement.onMouseUp(UIElement.java:1183)
at zombie.worldMap.UIWorldMap.onMouseUp(UIWorldMap.java:455)
at zombie.ui.UIManager.update(UIManager.java:816)
at zombie.GameWindow.logic(GameWindow.java:262)
at zombie.core.profiling.AbstractPerformanceProfileProbe.invokeAndMeasure(AbstractPerformanceProfileProbe.java:71)
at zombie.GameWindow.frameStep(GameWindow.java:765)
at zombie.GameWindow.run_ez(GameWindow.java:681)
at zombie.GameWindow.mainThread(GameWindow.java:495)
at java.base/java.lang.Thread.run(Unknown Source)

Originally posted by Darkswirl:

New UI doesn't work for me on existing save. it shows up, but buttons don't function.

LOG : General , 1693354506651> -----------------------------------------
STACK TRACE
-----------------------------------------
function: self -- file: AddMoreMapSymbolsUIEdit.lua line # 291 | MOD: Add More Map Symbols (AMMS)
function: onMouseUp -- file: ISButton.lua line # 56 | Vanilla

ERROR: General , 1693354506651> ExceptionLogger.logException> Exception thrown java.lang.RuntimeException: attempted index: null of non-table: null at KahluaThread.tableget line:1689.
ERROR: General , 1693354506651> DebugLogStream.printException> Stack trace:
java.lang.RuntimeException: attempted index: null of non-table: null
at se.krka.kahlua.vm.KahluaThread.tableget(KahluaThread.java:1689)
at se.krka.kahlua.vm.KahluaThread.luaMainloop(KahluaThread.java:492)
at se.krka.kahlua.vm.KahluaThread.call(KahluaThread.java:163)
at se.krka.kahlua.vm.KahluaThread.pcall(KahluaThread.java:1980)
at se.krka.kahlua.vm.KahluaThread.pcallBoolean(KahluaThread.java:1924)
at se.krka.kahlua.integration.LuaCaller.protectedCallBoolean(LuaCaller.java:104)
at zombie.ui.UIElement.onMouseUp(UIElement.java:1228)
at zombie.ui.UIElement.onMouseUp(UIElement.java:1183)
at zombie.ui.UIElement.onMouseUp(UIElement.java:1183)
at zombie.worldMap.UIWorldMap.onMouseUp(UIWorldMap.java:455)
at zombie.ui.UIManager.update(UIManager.java:816)
at zombie.GameWindow.logic(GameWindow.java:262)
at zombie.core.profiling.AbstractPerformanceProfileProbe.invokeAndMeasure(AbstractPerformanceProfileProbe.java:71)
at zombie.GameWindow.frameStep(GameWindow.java:765)
at zombie.GameWindow.run_ez(GameWindow.java:681)
at zombie.GameWindow.mainThread(GameWindow.java:495)
at java.base/java.lang.Thread.run(Unknown Source)

I have since discovered a mod incompatibility that was the source of my issue:
Soul Filcher's Awesome, specifically the Relaxing Time module.

update broke every single marker on my map to squares and when you click the icons on the new UI it removes other map symbols from use and they will not come back.

Update broke them for me too, existing save, the marks I put down jsut show up as black squares.

@skarvha
In the new update, the id symbols has been changed to allow them to be classified, resulting in squares instead of icons in the saved game. The old version of the mod will not be supported, sorry for the inconvenience. You can fix this only by erasing them with an eraser.

If I use your UI addon mod, I get this whenever I log back into my games. Some of my icons turn into whatever these squares are. 99.9% of them are all checkmark icons, so I don't know why it's doing this.
https://i.imgur.com/YGsON1P.jpeg

@That Person
Hi. Black squares instead of icons appear when the path to the icons in the folder changes. Perhaps you have some mod for textures, interface or map installed that passes paths through itself every time. Because of this, the game thinks that the path has changed and draws squares instead of icons.