#1 - Oct. 14, 2010, 11:45 a.m.
I'd recommend a good ole'fashioned generic reset UI first off, Lam.
Then, try these things prior to reinstalling ANY addons (and if you reinstall, make sure they are current).
See if that doesn't resolve some of this.
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