The jittering up and down of reds on certain movies with the 2800 can usually be corrected by putting the player into Film or Video mode, depending on what type of DVD it is, rather than Auto. Most movies don't show this jumping around so much, if at all. Rush Hour is one that does, for sure, and Austin Powers. You didn't say what movie you were watching in this case.
The chroma bug is usually described as streaks in the saturated colors, rather than jumping reds, but it would seem likely that they are at least related.
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