WowAce

This only happens once in a while. When it happens I can't click quest items anymore in the tracker. It just keeps giving me this error.

1x [ADDON_ACTION_FORBIDDEN] AddOn 'RoleIcons' tried to call the protected function 'UseQuestLogSpecialItem()'.
!BugGrabber\BugGrabber.lua:586: in function <!BugGrabber\BugGrabber.lua:586>
[C]: in function `UseQuestLogSpecialItem'
FrameXML\WatchFrame.lua:1400: in function `WatchFrameItem_OnClick'
[string "*:OnClick"]:1: in function <[string "*:OnClick"]:1>

Locals:
nil

I happened onto this same issue. I just spent a LOT of time investigating it. Do you have multiple chat window tabs open? Do you have "/ri system" or "/ri chat" turned on?

If the answer to both is yes then the following might apply to you.

Apparently the chat filtering appears to contain a bug on Blizzard's end. It starts with WATCHFRAME_NUM_POPUPS global variable and spreads from there with the right chain of events. It prevents quest items from being clicked in the quest tracker and talent/glyph changes.

I fixed it by turning off "/ri system" and "/ri chat" but I came across this forum thread with a different approach to fixing it:

http://forums.wowace.com/showthread.php?t=20452

It's a generic bug with Blizzard's Chat tabs and any addons that use chat filters.

Recommended workaound is: http://www.wowace.com/addons/blizzbugssuck/ (which includes LibChatAnim)