There can be a couple of different problems. The export may have run correctly but the playback looks bad because the data rate is too high. There is too much information for the video player to keep up. Or the export method that you selected is using a compression method that doesn't work well with your content.
Are you using Adobe Media Encoder to create the video file? If so, what are the settings for your output file? If you open the .mov that you created, can you single frame through the file to see if all of the content is there?
Thanks for the response. I have been exporting straight to .mov without using AME. I just went to use the encoder and it isn't working; fails with an error message on start up (had the same thing with Photoshop a couple of days ago). I've loaded both Animate and AME on another machine. The export is still bad creating the .mov. I tried to load the .mov into AME and got an error message saying that the source file did not have any 'importable streams'.
Can you open the .mov with Quicktime? If you can, how does it run? Once open try the Movie Inspector in QT and see what your data rate and compression are.
When you export to video are you changing the image size or the frame rate of the file? How large is the Animate file? How many frames, image size and frame rate?
Thanks for mentioning the Movie Inspector; I didn't know about that. If I step through a frame at a time there appears to be the correct artifacts in the sequence. Looks like is might be my rubbish video graphics card can't handle the data rate which was 370mbits. Frame rates were correct and the file was 225Mb. Looks like I might need to do a hardware upgrade.
Well that sort of sorts it out. That doesn't explain why Media Encoder won't accept the file. You should be able to encode your .mov to use a compressor that will give you a data rate that works well for your intended use.
In any case, I'm glad that you have a file that you can use.