Quote Originally Posted by tharding
Thanks Richard!

Does that mean it is likely to have been the difference between the 9600 & 9800 that was the cause? Or do I still potentially have a hardware issue that explains the tearing?

Cheers

Toby
flipping was a very simple mistake i made.

tearing is something apple did in the drivers that affects things when huge or slow movies are drawn.
and you were using huge movies.
they changed something between 10.3.2 and 10.3.3
its possible i might have to change something to try and fix this.