Zero DETAILS provided, so... Work through all of the steps (ideas) listed at http://ppro.wikia.com/wiki/Troubleshooting
If your problem isn't fixed after you follow all of the steps, report back with ALL OF THE DETAILS asked for in the FINALLY section, the questions at the end of the troubleshooting link... most especially the codec used... see Question 1
Have you installed the Premiere Pro CS5 (5.0.2) update? That update fixes a lot of problems, including some with audio synch.
After you install the update, clear the media cache to force the audio and video to be reprocessed. The audio synch bug that I'm aware of relates to a bug in how those media cache files are created.
Hi, thank you for trying to help me. I updated everything and cleaned my media cache. I went to Premiere Pr5, opened the project and now it shows all my media offline. I attempted to link the files to and it warns me "The selected file does not contain audio media used by clip references in one or more sequences.These audio clip references will be deleted and cannot be undone. Do you wish to continue?" I also attempted to import the files again, and now they are importing with no audio at all. How did my update do all that?!?!
Go to the troubleshooting link I provided and start working and reading... and note what I put in bold
You need to provide file DETAILS for more help
John is right that more details would help.
However, regarding the result of applying the update:
A few people have the experience that after appying the update, some codecs don't work. Specifically, the codecs that aren't included in the trial are disabled. To work around this problem of the update causing the software to revert to behaving like the trial version, it is sometimes necessary to uninstall and reinstall the application, as described in this thread:
this problem of the update causing the software to revert to behaving like the trial version
You guys still haven't fixed that?!
Hello There, I once had this problem (your original) but it was the imported clip that was at fault, if you hold down ALT you can move the audio with respect to the video, hope this helps
Hi, thanks for the advice. I'm back to square one, (after chasing my tail for hours on end) So if I hold down ALT, I can move the audio with respect to the video. Where do I do this? (in the pp5 moniter, or timeline??)
Hello, just press and hold ALT,then left click hold on the audio in the timeline and drag it to the right or left
Just as a total work around till you figure out what is causing the real problem try this.
create a new sequence
then unlink the audio from the video.
then you can move the audio till you find it is back in sync
make sure to turn on audio units so you can move the audio to get it in the right place.
then just use that new sequence and NEST it like it was the original video.
I know this doesnt fix what is causing the problem but should get you by till you do know what is.