Maximizer worked fine on my vista desktop but not my vista laptop (I'm 99% sure, I'll confirm tonight).

I think it may key off the resolution not being a native resolution to WoW... I have my wow setup to run 800x600 window mode on my laptop, of course maximizer in KeyClone tries to set it to 1/4th my 1680x1050 screen, which isn't quite 800x600.