William Jurgenson said: >> I uninstalled the old software, downloaded and installed latest >> (Intellimouse 5.1), but still no recognition of the buttons. > > >USB Overdrive will take care of that and most anything else as well: >http://www.versiontracker.com/dyn/moreinfo/macosx/13443 Actually, I had a Microsoft mouse, and I had the same problem with it under OS X. USB Overdrive surprisingly didn't restore the added functionality. I couldn't even get the scroll-wheel to function as a button anymore. Nothing helped. Randy B. Singer Co-Author of: The Macintosh Bible (4th, 5th and 6th editions) Routine OS X Maintenance and Generic Troubleshooting http://www.macattorney.com/ts.html