Logic 9 Audio and Video sync at beginning timecode, but not in the middle of playback.

Hey Guys,
I'm working on a Trailer for a feature length, and my video playback is pretty screwy.
I've double checked the video to be 23.976 framrat and set my project to that framrate, and I've done what I normally do with bitrate and sample rate. But currently my audio and video will not sync together when I start playback in the middle of my project.
Playback works fine in the start of the project, and everything looks and sounds great. But as I'm writing and edtiting further on in the project all the audio gets out of sync. If I start the project from the beginning, then all of the MIDI for the whole piece registers as synced, and the project sounds and looks great the whole way through. The problem comes from starting playback anywhere in the middle of the project.
I'm working with a .mov file (1:45 minutes); three .AAC audio files, and plenty of thrid-party plug-ins. 10.7.5 Mac OS X, 2.2 GHz i7 core, and 4GB m
of memory.
Any thoughts?
Thank you!

Thanks guys for the input.
I am using an Aurora 16 via firewire
I did change my buffer settings and that seemed to fix it but now I am at 128. I moved over to the aurora because I preferred the extra headroom. I guess I should have stuck with the apogee.
Tonight was the first time I had the opportunity to do a full tracking session with 9. I have been doing quiet a bit of mastering with no issues. Quiet a few issues. Everything from logic quitting to it just locking up. So far.....a pretty bad experience. I wonder if it could be Snow Leopard.......

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