Quote - Well, still no joy. Rokket, I tried your suggestions, and tried retiming, resampling keyframes, but no matter what I do, I still get frames 1 and 2, 3 and 4, are the same etc.

They want 60frames per second, so when the user slows down the animation, it is still a smooth animation.

When I open the quicktime file and show inspector, it shows 60fps, but if you load the QT file into a video editor, you can see the double frames.

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I presume you render to a series of images, and then convert to a movie, right? Are the duplicated frames (1+2) in the rendered images or only in the final movie? This should give you a hint where something goes wrong.