I can't remember for sure what version I was on, but just came back to the game for LK during the bonus XP month.. so recent.
I updated to 3.0.7 the usual copy over the old way and when I loaded it is completely broke.

AtlasLoot version
3.0.7

Lua error
Message: ...erface\AddOns\AtlasLootClassic\Addons\Favourites.lua:252: bad argument #1 to 'pairs' (table expected, got nil)
Time: Tue Oct 18 20:13:55 2022
Count: 1
Stack: ...erface\AddOns\AtlasLootClassic\Addons\Favourites.lua:252: bad argument #1 to 'pairs' (table expected, got nil)
[string "=[C]"]: ?
[string "@interface\AddOns\AtlasLootClassic\Addons\Favourites.lua"]:252: in function UpdateDb' [string "@Interface\AddOns\AtlasLootClassic\Addons\Favourites.lua"]:276: in function func'
[string "@interface\AddOns\AtlasLootClassic\AtlasLoot.lua"]:42: in function <Interface\AddOns\AtlasLootClassic\AtlasLoot.lua:34>

Locals: (*temporary) = nil
(*temporary) = "table expected, got nil"
= defined =[C]:-1

---

Message: ...erface\AddOns\AtlasLootClassic\Addons\Favourites.lua:333: attempt to index field 'activeList' (a nil value)
Time: Tue Oct 18 20:28:46 2022
Count: 1
Stack: ...erface\AddOns\AtlasLootClassic\Addons\Favourites.lua:333: attempt to index field 'activeList' (a nil value)
[string "@interface\AddOns\AtlasLootClassic\Button\Button.lua"]:760: in function SetType' [string "@Interface\AddOns\AtlasLootClassic\Button\Button.lua"]:727: in function SetContentTable'
[string "@interface\AddOns\AtlasLootClassic\GUI\ItemFrame.lua"]:199: in function Refresh' [string "@Interface\AddOns\AtlasLootClassic\GUI\GUI.lua"]:191: in function <Interface\AddOns\AtlasLootClassic\GUI\GUI.lua:43> [string "@Interface\AddOns\AtlasLootClassic\GUI\GUI.lua"]:947: in function ButtonOnClick'
[string "@interface\AddOns\AtlasLootClassic\GUI\Template_Select.lua"]:90: in function SetSelected' [string "@Interface\AddOns\AtlasLootClassic\GUI\Template_Select.lua"]:137: in function SetData'
[string "@interface\AddOns\AtlasLootClassic\GUI\GUI.lua"]:914: in function ButtonOnClick' [string "@Interface\AddOns\AtlasLootClassic\GUI\Template_Select.lua"]:90: in function SetSelected'
[string "@interface\AddOns\AtlasLootClassic\GUI\Template_Select.lua"]:137: in function SetData' [string "@Interface\AddOns\AtlasLootClassic\GUI\GUI.lua"]:889: in function ButtonOnClick'
[string "@interface\AddOns\AtlasLootClassic\GUI\Template_DropDown.lua"]:159: in function SetSelected' ... [string "@Interface\AddOns\AtlasLootClassic\Loader.lua"]:166: in function LoadModule'
[string "@interface\AddOns\AtlasLootClassic\GUI\GUI.lua"]:821: in function ButtonOnClick' [string "@Interface\AddOns\AtlasLootClassic\GUI\Template_DropDown.lua"]:159: in function SetSelected'
[string "@interface\AddOns\AtlasLootClassic\GUI\GUI.lua"]:247: in function <Interface\AddOns\AtlasLootClassic\GUI\GUI.lua:245>
[string "=[C]"]: in function Show' [string "@Interface\AddOns\AtlasLootClassic\GUI\GUI.lua"]:1031: in function Toggle'
[string "@interface\AddOns\AtlasLootClassic\Core\SlashCommands.lua"]:20: in function ?' [string "@Interface\AddOns\AtlasLootClassic\Core\SlashCommands.lua"]:58: in function Run'
[string "@interface\AddOns\AtlasLootClassic\MiniMapButton.lua"]:51: in function `OnClick'
[string "@interface\AddOns\Atlas\Libs\LibDBIcon-1.0\LibDBIcon-1.0.lua"]:144: in function <...ce\AddOns\Atlas\Libs\LibDBIcon-1.0\LibDBIcon-1.0.lua:142>

Locals: self = AtlasLoot_Button_1 {
0 =
ItemLvl = 80
RawName = "Emblem of Triumph"
SetContentTable = defined @interface\AddOns\AtlasLootClassic\Button\Button.lua:604
GetSecTypeFunctions = defined @interface\AddOns\AtlasLootClassic\Button\Button.lua:811
ItemID = 47241
formatTab =

{
}
SetPreSet = defined @interface\AddOns\AtlasLootClassic\Button\Button.lua:594
phaseIndicator = AtlasLoot_Button_1_phaseIndicator {
}
secButton = AtlasLoot_Button_1_secButton {
}
highlightBg = AtlasLoot_Button_1_highlightBg {
}
background = AtlasLoot_Button_1_background {
}
favourite = AtlasLoot_Button_1_favourite {
}
SetType = defined @interface\AddOns\AtlasLootClassic\Button\Button.lua:751
Clear = defined @interface\AddOns\AtlasLootClassic\Button\Button.lua:541
GetTypeFunctions = defined @interface\AddOns\AtlasLootClassic\Button\Button.lua:807
SetDifficultyID = defined @interface\AddOns\AtlasLootClassic\Button\Button.lua:799
extra = AtlasLoot_Button_1_extra {
}
__atlaslootinfo = {
}
AddEnhancedDescription = defined @interface\AddOns\AtlasLootClassic\Button\Button.lua:935
SetExtraType = defined @interface\AddOns\AtlasLootClassic\Button\Button.lua:780
completed = AtlasLoot_Button_1_completed {
}
SetNpcID = defined @interface\AddOns\AtlasLootClassic\Button\Button.lua:803
name = AtlasLoot_Button_1_name {
}
overlay = AtlasLoot_Button_1_overlay {
}
factionIcon = AtlasLoot_Button_1_factionIcon {
}
SetSecType = <function

---

Message: ...erface\AddOns\AtlasLootClassic\Addons\Favourites.lua:333: attempt to index field 'activeList' (a nil value)
Time: Tue Oct 18 20:29:46 2022
Count: 4
Stack: ...erface\AddOns\AtlasLootClassic\Addons\Favourites.lua:333: attempt to index field 'activeList' (a nil value)

Locals:

Describe the bug
Most of the time will not show item lists. Will show normal/heroic and multiple boss selections highlighted at the same time.

To Reproduce

Expected behavior

Screenshots

Additional context
Went back to 3.06 and no difference.
Deleted all the folders and reloaded WoW, then reinstalled 3.0.7 and reload again and no change.
Possibly some stored conflict?
I will play with it some more, but I don't have time at the moment

Deleted all the folders and reloaded WoW

Did that include the SavedVariables? I'd assume there's your problem. You should try:

• Quit WoW
• Delete or move your World of Warcraft/_classic_/WTF/Account/YOURACCOUNT/SavedVariables/AtlasLootClassic.lua
• Start WoW and check if the issue persists

Edit: I'd recommend you move the file instead of deleting it. If moving it (e.g. to your documents/desktop) solved the issue you could upload the file here to have a closer look what went wrong.