I havn't patched yet but I ususaly have no problems. I also do what the others say, have a single wow directory on all 6 of my computers, and just update each computer, no symlinks or anythings.

I am sure all the addons are going to break so I doubt i gonna log in for a few days untill they sort all that out.

I have a single wtf folder that has sub folders for each of my 31 guys that i copy to all my computers (after I do things to the files) from my main computer and have like 10 back up copies so I not going to lose anything.

Aion is looking hot hot hot though.