Originally Posted by
Hivetyrant
I have had the same thing happen to me a few times, you can cause it in Windows 7 by clicking the WoW icon in the task bar to minimise it and it will stay locked in its smaller state unless you remove windowed mode.
I don't have spybot so I doubt its that, then again, I doubt it's any WoW add-on, more likely an OS thing.
However if you close the affected window and re-launch your character set, ISBoxer should see that the others are still open and only re-launch the one you closed (which is awesome I might add)
Anyways, you're not alone, i'm still trying to figure out what causes it as well! (when I don't do it by accidently clicking on the icon in the task bar)