The BulkMail skin was obsoleted a while ago, although BMI does use QTip which is skinned. Which version of BMI are you using? I installed the latest release, 16.08.21, but it has errors and doesn't load.
The reason the button isn't skinned is because the skin relies on the AchievementUI being enabled in the Player Frames options as well as Button skinning being enabled, which is disabled for TukUI. As you are using AddonSkins, looking at the screenshot you provided, you have disabled this option.
AddonSkins provides a skin for AchieveIt which skins the button.
2x :HookScript is not allowed on LibQTip tooltips [string "@TinyTooltip\Core.lua"]:762: in function `v' [string "@TinyTooltip\libs\LibEvent.lua"]:121: in function `trigger' [string "@Skinner\Core\UIFrames.lua"]:6279: in function <Skinner\Core\UIFrames.lua:6277> [string "@Skinner\Core\SharedFuncs.lua"]:11: in function `add2Table' [string "@Skinner\AddonSkins\LibQTip.lua"]:10: in function <Skinner\AddonSkins\LibQTip.lua:6> [string "@Skinner\AddonSkins\LibQTip.lua"]:22: in function <Skinner\AddonSkins\LibQTip.lua:20> [string "=(tail call)"]: ? [string "@HandyNotes_NPCs (Burning Crusade Classic)\HandyNotes_NPCs (Burning Crusade Classic)-1.07.lua"]:77: in function <...assic)\HandyNotes_NPCs (Burning Crusade Classic).lua:73> [string "=[C]"]: ? [string "@HandyNotes\HandyNotes-v1.6.4.lua"]:56: in function <HandyNotes\HandyNotes.lua:51> [string "@HandyNotes\HandyNotes-v1.6.4.lua"]:166: in function `OnEnter' [string "@HandyNotes\HandyNotes-v1.6.4.lua"]:391: in function <HandyNotes\HandyNotes.lua:390>
Outfitter issue only happens on the context menus in the Character Screen and LDB right click and started after last Blizz patch (9.1.5). Was perfect until then.
Another issue which I think but I'm not so sure is the LFG which I don't use any Addon. The issue is that when I try to start a group in LFG (Questing, Custom, etc.) it doesn't show what I'm typing however it's typing indeed because when I click List Group it works and what I "blind" typed it's there. If I misspelled and click edit again doesn't show what I'm typing. As a side note, Reloads fixes the issue.
Getting spammed with the following when recruiting troops in my DK Legion Hall
50x Skinner\Core\UIFrames.lua:2842: attempt to index local 'btn' (a userdata value) [string "@Skinner\Core\UIFrames.lua"]:2842: in function <Skinner\Core\UIFrames.lua:2839> [string "=(tail call)"]: ? [string "=[C]"]: in function `GarrisonCapacitiveDisplayFrame_Update' [string "@Blizzard_GarrisonUI\Blizzard_GarrisonCapacitiveDisplay.lua"]:273: in function <...rd_GarrisonUI\Blizzard_GarrisonCapacitiveDisplay.lua:267>
1x Skinner\Core\UtilFuncs.lua:1019: attempt to index local 'frame' (a nil value) [string "@Skinner\Core\UtilFuncs.lua"]:1019: in function <Skinner\Core\UtilFuncs.lua:1018> [string "@Skinner\Core\UtilFuncs.lua"]:1052: in function `removeNineSlice' [string "@Skinner\Core\UIFrames.lua"]:2117: in function <Skinner\Core\UIFrames.lua:2116> [string "=(tail call)"]: ? [string "=[C]"]: ? [string "=[C]"]: in function `Show' [string "@Interface_TBC\FrameXML\UIParent.lua"]:2537: in function `ShowUIPanel' [string "@FrameXML\UIDropDownMenu.lua"]:1405: in function `OpenColorPicker' [string "@Interface_TBC\FrameXML\ChatConfigFrame.lua"]:1492: in function `MessageTypeColor_OpenColorPicker' [string "*:OnClick"]:1: in function <[string "*:OnClick"]:1>
Locals: frame = nil (*temporary) = nil (*temporary) = nil (*temporary) = nil (*temporary) = "attempt to index local 'frame' (a nil value)"
While you said you were not able to reproduce the Outfitter issue it's fixed now with this version...as for the LFG I'll let you know if is fixed or not since 90% of the time is good as soon I log in...As soon it happens and IF happens again I'll do a screenshot and post it here so you can see it.