No suggestion, but another question (to satisfy my curiousity
):
Do you happen to have some kind of Windows shell or Windows skinner or other programs which manipulates windows in some sort of way? Like 'WindowsBlinds' or some other windows enhancer or something? Or a program which adds stuff to all windows (like extra menus, a clock, etc)?
Reason for asking: the tabbed chat feature manipulates the actual chat windows and hides 'n shows them, and this might conflict with another 'windows manipulator/enhancer'.
/ 
