Just switched over from the open source driver to the prerelease fglrx in debian sid. Kernel module loaded fine and xorg comes up just fine. Most things appear to be working normally (as with the open source) but noticing that flash videos on particular have a lot of vertical refresh as well as occassional hangs. I've tried with hardware acceleration in flash on and off and same result.

Any thoughts on settings to get it working or is this a known proprietary driver issue? My system is a dell studio 15 with hd4570 card.