Stuck in Instance...

Q u o t e:
My character seems to be stuck in UP. I cannot hearth, teleport: moonglade, etc. The Teleport to Graveyard option in the Character Stuck help option doesn't work either. I cannot seem to interact with anything in the instance (i.e. mobs don't attack).

Do you happen to be shape-shifted, and have you tried relogging?

When's the last time you totally reset your UI?

That can't hurt a thing, and may very well help.

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

Edit: Your realm isn't in the middle of a restart is it?

Q u o t e:
I will attempt a complete UI reset. My realm was not in a restart. I zoned into LFD, but was not included in the group. The instance tried to teleport me to the nearest graveyard, but failed to do so (lockup). When I relogged, I was the only person in the instance and I was stuck there. Will post on the UI reset results shortly.

Yeah, sounds like you got totally de-sync'd from everything.