Please excuse me if this is not in the correct place. I have a Macbook with OSX 10.6.8 and iPhone 3Gs (5.x). Tethering used to work on both USB and Bluetooth. Just last week for some unknown reason, USB tethering stopped working on my Macbook but STILL works on a Windows XP machine. Bluetooth still works but sometimes I prefer USB tethering. It can still charge and sync data with iTunes through USB. I used to see iPhone listed under my network preferences when I connect through USB but that is not on the list either. Anyone know what went wrong or have any possible solutions for me? I'm on Bell Mobility Canada (allows tethering). Thanks.