I was working on some stuff for school, and all of a sudden the trackball and keyboard became unresponsive, as did the keyboard and trackpad on a mid-09 uMBP. I unplugged the USB and reconnected, but the light for the trackball did not come on as usual, indicating no power. I had to power the machine down manually, unfortunately. This keyboard and trackball are both plugged into a 7-port USB Belkin hub, of which has worked reliably for ages. The only variation was that a Kingston USB stick was plugged in at the time, directly to the computer. Console Logs don't really tell me much, other than that it was improperly shut down (obviously). Anyone ever have this issue?