1. Log into to an alternative character.
2. Set your graphics settings to high.
3. Relog into your main.
It should fix it, it worked for me and many others.
Also, if it still doesn't work;
Set graphics to high
Set resolution to 1024x756 (the larger one)
Full screen game
1st time made me "wtf" for 5 minutes before I fixed it >_<