Moving mouse to right side of screen switches windows

I just started using Keyclone and I believe this issue is caused by the program. If Keyclone is closed or in "setup" mode, it doesn't do this.

I'm running two instances of WoW, Hunter and Priest. While on the Hunter, when I move my mouse all the way over to the right side of the window, WoW switches to the other account. It does not do this with the Priest account. Is there any way to keep WoW or Keyclone from doing this?


Notes:
Both windows are in windowed + maximized mode.

I was only able to set Keyclone up using one account. In Win7 the program crashes when I try adding more than one account, so I manually add a second instance of WoW each session. This may or may not be a part of the problem.