What could be causing this problem where I move my mouse out of the mce body and it loses focus. For example, I'm typing this box but if my mouse is not directly on this box, I won't be able to type anymore. Only when I move my mouse back into the box will I be able to continue typing.

EDIT: It looks like ad inserter pro is causing this problem. I recently upgraded to ad inserter PRO. I will investigate this further.