Like the images were assembled out of sequence, or the moving components had somehow become possessed? I ran into the issue of a Poser figure animated with a bvh file that would take it into its head to suddenly rotate around on its root node at certain points. What it turned out to be was an error in trigonometry. They were dance bvh's and whenever the figure would spin, at the transition point on the Y axis where you went from -180 degrees to +0 degrees, the values would get crazy. Oh for example, you would be at -172Yrot, the next value -should have been -179Yrot, but what you would actually have is +1Yrot, and your X and Z values would have gone from single digits to the opposite end of the degree spectrum. Poser interpolated the translations correctly, and mathematically they were accurate, but Vue had a fit with it. The only fix was manually changing the values in each one of the offending frames. As for codecs, I've had the best luck with the DivX 4.12 codec myself. And while it -shouldn't- be an issue as to what OS's are present, it may be that 98 isn't dealing with the networking very well; 9x and NT based boxes can act...strangely, together. You might want to add disabling the 98 box and running a test, and see if that has any effect.