I have been using AE since 2006. I now run CS6 and have run into a problem on an install on a Mac, just a few months old. I'll make this as short as possible.
I imported an audio file from Garage Band. I import it into a composition. I use the pre-render to listen to it. It sounds fine the first time. If I stop it and restart it--at the same place OR moving to a new location in the time line, it now plays at a much lower pitch--Darth Vader like. I can take the same audio file and import it into AE on two previous machines, and this problem does not happen.
I can't find a setting that is different. I can't fid a way to completely reset AE to see if something changed that I am not aware of.
My guess would be you've imported a 44.1k sampled file into a 48k composition. You can try to reinterpit the file or come out of garage band with a file that matches your composition.
I thought about that, but what would account for it playing normally the
first time I do the pre-render to listen to it? Is it handling the audio
differently that first time? I will look at that further.
Thanks for the suggestion. Worth a look.