I'm having trouble getting a USB Mouse to work with my MBP. Strangely, I see the device in System Profiler as USB OPTICAL MOUSE, however when plugged in, it lights up, though I cannot move the cursor or click with it. My trackpad works fine. The mouse is generic, and was purchased on eBay. In addition, I know the issue is software- and not hardware-related because the mouse works fine in both W7 Bootcamp and in choosing a boot device on the startup menu (after I press Option during boot). On my previous MacBook, also running SL, the mouse worked fine, so I don't think it could be a driver issue. At home, my Magic Mouse works perfectly over Bluetooth, and I use an app called BetterTouchTool to add functionality to that and my trackpad. I tried quitting that program but the problem seemed to continue. Any help on getting this mouse to work would be great. Thanks in advance!