Using the build from about October 3rd. This error is probably being misattributed, but it's not everyday I get to report a bug from Bugsack itself lol. It errored from opening the [Default WoW] Options menu.

1x [ADDON_ACTION_FORBIDDEN] AddOn 'BugSack' tried to call the protected function 'SpellStopCasting()'.
[string "@Interface/AddOns/!BugGrabber/BugGrabber.lua"]:480: in function <Interface/AddOns/!BugGrabber/BugGrabber.lua:480>
[string "=[C]"]: in function SpellStopCasting' [string "@Interface/FrameXML/UIParent.lua"]:4003: in function ToggleGameMenu'
[string "@Interface/SharedXML/Settings/Blizzard_SettingsPanel.lua"]:203: in function TransitionBackOpeningPanel' [string "@Interface/SharedXML/Settings/Blizzard_SettingsPanel.lua"]:192: in function ExitWithCommit'
[string "@Interface/SharedXML/Settings/Blizzard_SettingsPanel.lua"]:168: in function Close' [string "@Interface/FrameXML/UIParent.lua"]:3981: in function ToggleGameMenu'
[string "TOGGLEGAMEMENU"]:1: in function <[string "TOGGLEGAMEMENU"]:1>

This is caused by dropdown taint. To replicate open the BugSack options and use a dropdown found there (don't need to change its value, just opening it is enough) and then open Edit Mode.

Same reproduction method as above, but when I do it, it errors attempting to call a different protected function:

2x [ADDON_ACTION_FORBIDDEN] AddOn 'BugSack' tried to call the protected function 'TargetUnit()'.
[string "@Interface/AddOns/!BugGrabber/BugGrabber.lua"]:480: in function <Interface/AddOns/!BugGrabber/BugGrabber.lua:480>
[string "=[C]"]: in function `TargetUnit'
[string "@Interface/FrameXML/EditModeManager.lua"]:1500: in function `RefreshTargetAndFocus'
[string "@Interface/FrameXML/EditModeManager.lua"]:1431: in function `OnEditModeEnter'
[string "@Interface/FrameXML/EditModeManager.lua"]:171: in function `EnterEditMode'
[string "@Interface/FrameXML/EditModeManager.lua"]:192: in function <Interface/FrameXML/EditModeManager.lua:190>
[string "=[C]"]: in function `Show'
[string "@Interface/FrameXML/UIParent.lua"]:2846: in function `SetUIPanel'
[string "@Interface/FrameXML/UIParent.lua"]:2650: in function `ShowUIPanel'
[string "@Interface/FrameXML/UIParent.lua"]:2554: in function <Interface/FrameXML/UIParent.lua:2550>
[string "=[C]"]: in function `SetAttribute'
[string "@Interface/FrameXML/UIParent.lua"]:3152: in function `ShowUIPanel'
[string "*GameMenuFrame.xml:94_OnClick"]:2: in function <[string "*GameMenuFrame.xml:94_OnClick"]:1>

(the 2x is just because I reproduced it twice, don't worry about that)

Gonna go ahead and close this. I've not seen it but let me know if it still happens.