Issue with Maximizer

Ok, so before I posted this I did a search, and perhaps looked up the wrong thing. So I'm sorry if this has been discussed before.

Anyways, here is my issues, I 3 box (priest/lock/lock) My Priest is my main, and my two locks are on my 15'' moniter. I set both my locks to 550,420 (ish) Res that takes of basically 2/3 of my screen and looks all pretty and perfect. The problem is, when I log on and hit Enter to get my chars in the game and the loading screen appears, my main Priest (Not on maximizer) loads in perfectly, and I see my locks log in, but the loading screen never goes away and then WoW "Is not responding" happens. I've tried to log 1 char in at a time. Still no go, the only way is to not use maximizer. Anyclue as to why?