I have a black MacBook (bought June '08). Lately (the last few days or week), every now and then certain keyboard shortcuts and mouse functions would stop working. From what I can tell, they include: -Both Mighty Mouse functions (dashboard middle button and Exposé side buttons) -Apple-Space for Spotlight -Apple-Tab and Apple-` to switch windows -All Exposé functions - mouse to any corners, and the F3 and F4 buttons (all the other fn buttons seem to work fine) At first it seemed like it happened a) after I finished using Vista in Parallels 4 and b) after I installed my new RAM (2x2 GB Crucial), since the first couple of times it happened it was after I turned off Parallels, and this all started right around when I installed the RAM. But lately I haven't even used Parallels and this still happens. It used to happen every few days, now it's happened twice in 24 hours. The only solution I've found is a restart. Any idea what could be going on?