#8 - Oct. 13, 2010, 6:58 a.m.
Just as a point of clarification - has anyone that's been experiencing this fully reset their UI and has this happened with NO addons installed?
With the number of changes to the game with this last patch, conflicts and errors with existing addons could easily be causing issues - and in some cases even very odd issues.
I'd give a full reset UI a try first, do NOT reinstall any addons and retest as a first trouble-shooting step.
If you continue to experience the same thing after, please do let us know as soon as possible.
To do a full reset UI, you will want to save your addons in another spot if you wish to preserve them.
Then rename/delete or move your WTF, Cache and Interface folders while WoW is shutdown.
Reboot your system. Note, if you are running Vista make sure your permissions are set so it does not undo your changes.
More detailed instructions for different operating systems, including Macs are here.
http://us.blizzard.com/support/article.xml?articleId=18761&searchQuery=reset%20UI&pageNumber=1