…What Dave said.
If you want to try some troubleshooting yourself, here are some things to look for:
– Is it consistently failing at the same spot? If so, that’s where to begin looking for the problem. Could be an effect that’s using up too much memory, a reference to a file that is corrupt or moved, etc. Find that spot, and start testing. Maybe set up a render area about 1 sec long, over that trouble spot, so you can start turning layers off one-by-one until the render succeeds. Keep narrowing it down until you find your problem.
– Is AE giving you any sort of error message or code? If so, Google is your friend. I doubt there’s any problem you can create in AE that someone else hasn’t already solved elsewhere.
– You said you’re basically making 20 variations of the same thing. Once you get your problem pinned down and solved, you should probably look into doing some pre-rendering. For example, if all of these projects use the same background elements, pre-render that background only, which can then help significantly decrease your render times. Do a little searching on this topic – it’s essentially the same as doing your normal renders, but with a few minor changes.
Good luck!
Kyle Hamrick
Editor/Motion Graphics Artist
http://www.kylehamrick.com