Hi, Right after I bought a new MBP with OS X 10.7.4 on it, I couldn't use my logitech mx revolution mouse(Model Number: M-RBQ124) any more. The computer cannot detect the device at all. I read someone saying they lost some advanced functions but it is even worse in my case. I'm sure it's turned on and the software I downloaded from Logitech is the lastest version. (http://www.logitech.com/en-us/428/130?section=downloads&bit=&osid=9) (Software Version: 220.127.116.11). When I use the logitech control center, it still couldn't find the mouse. Any ideas? Please help! Thx. Edgar ---------- by the way, it's working on PCs just fine.