Anybody have this happen to them? I'll be browsing the net using Safari and then suddenly the pointer, or cursor will just vanish. When this happens I can still move the "invisible" cursor around--moving the cursor over my tabs or bookmarks bar items will have them respond as they do when I usually mouse-over those items. The pointer will kinda disappear and then reappear and then disappear again. I haven't noticed this happening while doing anything other than using safari. I use a bluetooth mouse- a wireless IntelliMouse Explorer. When I experience the disappearing I will switch to the trackpad and it still vanishes and reappears. Any suggestions??