#1 - Oct. 15, 2010, 9:16 a.m.
There were some phasing issues with this patch, but for most players - there is a fairly simple workaround.
Go to Wintergrasp (or any other BG), then back to town. While this isn't addressing 100% of players with this issue, it is resolving it for a great many of them.
I'd try that first.
If that does NOT seem to help, you'll want to submit an ingame petition stating you have a phasing issue so it can be looked into further.