WoW Version
Retail

AddOn skin name
Skinner

I don't have a bug output for you because I don't get any errors but everything breaks with the new update. I had to roll back to the previous version. The new version is very inconsistent. The options to change the backdrop and background colors are gone. Some elements are skinned while others are not.

Getting multiple errors.

Not sure if it is connected to the OPs problem or not.

3x Skinner/Core/NewSkinFuncs.lua:524: attempt to call method 'addButtonBorder' (a nil value)
[string "@Skinner/Core/NewSkinFuncs.lua"]:554: in function ?' [string "@Skinner/Core/NewSkinFuncs.lua"]:288: in function skinObject'
[string "@Skinner/AddonSkins/HandyNotes.lua"]:15: in function <Skinner/AddonSkins/HandyNotes.lua:5>
[string "=[C]"]: in function xpcall' [string "@Skinner/Core/UtilFuncs.lua"]:358: in function <Skinner/Core/UtilFuncs.lua:351> [string "=(tail call)"]: ? [string "@Skinner/Core/AddonFrames.lua"]:103: in function AddonFrames'
[string "@Skinner/Core/Skinner.lua"]:362: in function <Skinner/Core/Skinner.lua:362>

5x Skinner/Core/NewSkinFuncs.lua:703: attempt to call method 'skinCloseButton' (a nil value)
[string "@Skinner/Core/NewSkinFuncs.lua"]:753: in function ?' [string "@Skinner/Core/NewSkinFuncs.lua"]:288: in function skinObject'
[string "@Skinner/RetailSupport/UIFrames_Retail.lua"]:2757: in function <...aceSkinner/RetailSupport/UIFrames_Retail.lua:2563>
[string "=[C]"]: in function xpcall' [string "@Skinner/Core/UtilFuncs.lua"]:358: in function <Skinner/Core/UtilFuncs.lua:351> [string "=(tail call)"]: ? [string "@Skinner/Core/AddonFrames.lua"]:128: in function BlizzardFrames'
[string "@Skinner/Core/Skinner.lua"]:360: in function <Skinner/Core/Skinner.lua:360>

3x Skinner/Core/UIFrames.lua:2691: attempt to index field 'modUIBtns' (a nil value)
[string "@Skinner/Core/UIFrames.lua"]:2691: in function <Skinner/Core/UIFrames.lua:2666>
[string "=(tail call)"]: ?
[string "=[C]"]: in function NavBar_AddButton' [string "@Blizzard_WorldMap/Blizzard_WorldMapTemplates.lua"]:525: in function Refresh'
[string "@Blizzard_WorldMap/Blizzard_WorldMap.lua"]:356: in function <...rfaceBlizzard_WorldMap/Blizzard_WorldMap.lua:353>
[string "=[C]"]: ?
[string "=[C]"]: ?
[string "=[C]"]: ?
[string "=[C]"]: ?
[string "=[C]"]: ?
[string "=[C]"]: ?
[string "=[C]"]: ?
...
[string "=[C]"]: ?
[string "=[C]"]: ?
[string "=[C]"]: in function Show' [string "@Blizzard_UIParentPanelManager/Mainline/UIParentPanelManager.lua"]:880: in function <...ParentPanelManager/Mainline/UIParentPanelManager.lua:866> [string "=[C]"]: ? [string "=[C]"]: in function ShowUIPanel'
[string "@Blizzard_WorldMap/QuestLogOwnerMixin.lua"]:106: in function SetDisplayState' [string "@Blizzard_WorldMap/QuestLogOwnerMixin.lua"]:42: in function HandleUserActionToggleSelf'
[string "@Blizzard_WorldMap/Blizzard_WorldMap.lua"]:511: in function `ToggleWorldMap'
[string "TOGGLEWORLDMAP"]:1: in function <[string "TOGGLEWORLDMAP"]:1>

3x Skinner/Core/NewSkinFuncs.lua:472: attempt to call method 'addButtonBorder' (a nil value)
[string "@Skinner/Core/NewSkinFuncs.lua"]:472: in function <Skinner/Core/NewSkinFuncs.lua:429>
[string "@Skinner/Core/NewSkinFuncs.lua"]:476: in function ?' [string "@Skinner/Core/NewSkinFuncs.lua"]:288: in function skinObject'
[string "@Skinner/Core/UIFrames.lua"]:3214: in function <Skinner/Core/UIFrames.lua:3206>
[string "=(tail call)"]: ?
[string "=[C]"]: ?
[string "=[C]"]: in function Show' [string "@Blizzard_StaticPopup/Mainline/StaticPopup.lua"]:714: in function StaticPopup_Show'
[string "@Blizzard_UIParent/Mainline/UIParent.lua"]:1524: in function <...rfaceBlizzard_UIParent/Mainline/UIParent.lua:1290>

4x ...aceSkinner/RetailSupport/UIFrames_Retail.lua:3857: attempt to index field 'modUIBtns' (a nil value)
[string "@Skinner/RetailSupport/UIFrames_Retail.lua"]:3857: in function <...aceSkinner/RetailSupport/UIFrames_Retail.lua:3827>
[string "=(tail call)"]: ?
[string "=[C]"]: ?
[string "=[C]"]: in function Show' [string "@Blizzard_UIParentPanelManager/Mainline/UIParentPanelManager.lua"]:880: in function <...ParentPanelManager/Mainline/UIParentPanelManager.lua:866> [string "=[C]"]: ? [string "=[C]"]: in function ShowUIPanel'
[string "@Blizzard_WorldMap/QuestLogOwnerMixin.lua"]:106: in function SetDisplayState' [string "@Blizzard_WorldMap/QuestLogOwnerMixin.lua"]:42: in function HandleUserActionToggleSelf'
[string "@Blizzard_WorldMap/Blizzard_WorldMap.lua"]:511: in function `ToggleWorldMap'
[string "TOGGLEWORLDMAP"]:1: in function <[string "TOGGLEWORLDMAP"]:1>