Video players are showing videos with inverted colors in Natty 11.04

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http://askubuntu.com – All video players are showing videos, local video files in many different formats (flv, webm, ogg, 3gp, mp4), in negative/inverted colors. The same videos are displayed ok by firefox with some exceptions. The only case I have found to fail is firefox displaying online: http://www.808.dk/pics/video/gizmo.mp4 while: http://www.808.dk/pics/video/gizmo.webm is displayed ok but not when I download and view it with video-players like banshee, vlc, totem... In Totem, if I take a snapshot of a video being displayed with inverted colors, the snapshot looks ok. Also the thumbnails in nautilus show (HowTos)