Movement keys "sticking"?

Alrighty now, I've got a bizarre problem.

I've a 17" MacBook Pro, and I use alt+arrow keys and alt+pgup/pgdn to move my camera around. On my MacBook, pgup and pgdown are shared with the up and down arrow keys, using the fn key. Not sure this is important, but it's worth mentioning. when scrolling around as I normally do, sometimes the keys will "stick" (not physically) and leave me spinning, or walking away in a random direction (if standing) or leave my camera spinning, or zooming (if sitting). Only way I can get it to stop is to bang randomly on the keys that affected it until it stops. not sure what exactly causes it to stop, seems to vary -- sometimes going into mouselook does it.

I've noticed this more when I'm holding fn, alt, and up/down arrow (essentially, alt+pgup/pgdn) and I press left or right arrow (home or end with fn held)

not sure if this is something to do with my software, or if there's another mac user out there with the same problems. it's rather annoying, and a pain in the arse when I'm trying to build

Thanks in advance!

CCC

I've had the same problem intermittently, but never been able to stop it...have had to relog

you can fix this just hitting Fn or the arrow keys a few times again. This is a reproducable problem that happens using the Fn key. Ive always been able to get it to stop. I only run into it on accident using PgUp and PgDwn for flying, as its much much easier to move the camera with the trackpad than the arrow keys.