Im having exactly the same problem

only i have a 17`screen and having the maximizer setup so i get 2 WoW´s running horizontal, one up one down.

I now have the maximizer setup at the resolution 1600x600 wich should make it wide, and fix it.

but it seems its not fixing it.

Maximizer setup:



WoW running with that setup (missing 1 wow running, but this should do):



how to fix this?