I have been using a 5 button mouse with Pro and I love it! Problem is, the left mouse button keeps wearing out...I've been thru 2 now. It WAS a Microsoft IntelliMouse Explorer 4.0. My replacement mouse is a Micorsoft IntelliMouse Explorer 3.0. The buttons all seem to be working, but I have noticed some strange behavior with Pro. There are times when it seems like ProE is lagging behind and it needs to "catch up". The screen turns black and doesn't respond for 30secs or so. My mouse cursor is still visible and I can switch to other applications. I'm attributing this to my new mouse as this behavior started shortly after the switch.
Anyone seen this before? I know that 5-button mice seem to throw ProE for a loop, but I really like the thumb buttons.