Ubuntu video problems-video in player out of sync
 

I recently upgraded from Ubuntu 6.10 to 7.04 (Feisty Fawn). Since then when I try to play video, including Kaffeine's goom visualization and Quicktime videos all I get is a bunch of streaks covering the top 2/3 of the window with five overlapping images and the remaining 1/3 black. Goom worked normally before I upgraded. And the sound accompanying QT videos stutters.

Any suggestions how to correct this?
:newbie: