Washed Out Color on Playback
Theora-encoded videos played through Quicktime (on Mac) using XiphQT are incorrectly reproducing the color of the video, and appear slighly, but noticably, washed out. The same videos can be played via VLC and Firefox and are true to the original - so I don't believe it's a problem with the videos themselves or the encoding.
I'm observing this problem on Snow Leopard, using Quicktime 7 (theora files don't load with Quicktime X) and XiphQT 0.1.9.