Pro Tools Le 6.9.2 Crashes on Specific Events

[LoganGrime]

It normally doesnt do this and has been lately. Just unexpectadly quitting if

1. I record, press apple z to undo and then hit record again
2. bounce, at the very end of the bounce it will shut off
3. quit, if i save and then quit, as its quitting it will say that it unexpectedly quit

i have re installed already and it is still happening


imac g5 1.25 gigs of ram

PTLE version 6.9.2

Originally bought 6.9 and upraded to 6.9.2 for Mac OS 10.4.6

Thanks a lot!