In after effects cs5, when I preview the composition, the video and audio match up perfectly, but when I render it, the audio is out of sync, and randomly. Or the video is slower, I am not sure what is happening, but it is very frustrating to make a video and match up audio perfectly, but then it does not render out the same way as I edited it.
Have you installed the After Effects CS5 (10.0.1) update? That update fixes a lot of problems, including some with audio/video synchronization.
Also, we need much more information if we're going to help you, such as operating system, source footage types, and output settings.
I have not, will try that, thanks