This is a problem that happens to me frequently on a terrible internet connection in Asia. Here is a debug log of me logging into feerrott, then hammering off of a mob. The client never finished zoning just froze at the screen of my hammer proccing:
http://pastebin.com/Lmwb3cDc
The following is a log of me attempting to log in from char select. The client gets a full loading bar, then just sits at the char select with loading bar full (I have loading screen art set to off)
http://pastebin.com/EHAw501p