Bluetooth Intellimouse Explorer will no longer trigger expose! It used to. Help

I have a Microsoft bluetooth intellimouse explorer. I have it set up to trigger "expose all windows" with the small thumb button. The scroll wheel is set up to trigger "expose show desktop" when pressed. I have microsoft intellipoint installed. This used to work just fine. I moved recently and i haven't used my bluetooth mouse for about 2 months. Now when i try to trigger expose it wont do anything. When i have my curser over "mail" and only "mail" it will make the chime that expose makes when it can't do anything. Does anyone have any ideas?

Thanks in advance for any input.

Trash the application software and do a clean install from the CD after checking Microsoft for later drivers.

I just tried that. It didn't help unfortunately.

I found a way around it. I set the buttons i want to use with expose to "handled by os". Then i set the buttons to control expose in the expose preference pane