Freeze on exit

[Treesh]

Lately (since the patch I think) I've been running into the problem that my computer freezes completely when I try to exit WoW.  It does this about half of the time and then has to be power cycled.  I've tried just leaving it, hoping that it is just going slow, but I've walked away for hours and came back to find it still locked up.  So does anyone have any idea what could be causing WoW to lock the computer up on exit?

While playing the game itself, everything is fine.  I've tried logging out first and then exiting from the login screen, but it froze when I did that as well.  I'm currently debating if I should alt-tab out and force the program to close instead of exitting cause at least then I won't have to do a hard power cycle.  Its really bad for the comp either way though so I'm hoping somebody has a clue how to fix it.  I've also tried deleting the WTF and WDB folders with no real luck.
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I frequently have this issue as well, but it doesn't actually lock up the entire machine. It only refuses to release control of the main monitor so it seems like it's locked up, but it's not. Doing some neat little tricks, I can bring up the task manager on the second monitor and just force the game to give it up that way or if worse comes to worse, restart the machine. Another trick we've done in the past (when GG wasn't running a second monitor) was if GG's machine pulled that trick, I'd remote desktop in under his username and that'd fix it too. And yes, it really blows for those people who don't have these other options. My sympathies Swirly.

This latest patch has made it act like this more often than not although, I don't remember if it behaved well after I installed the latest nVidia drivers for my card. I only installed them last night or the night before (yes, they were put out on the 11th. I was a little behind.) and since there is maintenance this morning, I haven't been able to get a good sample size to tell if it really has improved or if I've just been lucky a couple more times. If you have an nVidia video card, you may want to install the new drivers and see if it helps.

Edit: Oh, and reading vor lord's post up there, I don't run any UI mods and it still did it to me frequently after the patch.