As I was playing right now, and after crashing (I didn't think more of it at the time) I noticed that one of my characters always crashes the game when logging in. I can log into the rest without any problem, but my main crashes the game no sooner I show up in stormwind after logging in.
I have used unstuck already, thinking that it could be a bugged location (is that a thing?) but nothing changed. The moment I log in, the game goes to ****.
Which realm/expansion are you playing? It may be possible that it is WotLK and yu are using the new WoD model version of the client. I would suggest if this is the case to use the old non-WoD models client as the newer one seems to have alot of issues.
Not 100% sure if that would be your issue, but you may also try (with the game shut down) clearing your cache and WTF folders