Video Lags Behind Audio in Preview Pane, Timeline and Rendered Video

Hello,
I'm having an issue with a six minute video that I grabbed from the media browser in Premeire and am attempting to use in my timline. The first few mins of the 6 minute video is fine, but as the video progresses in the preview pane the video starts lagging behind and finally towards the end is probably half a second behind. The mp4 file plays fine outside the confines of Premeire. I've tried reloading a new file, etc, but nothing seems to work.
Also, I uploaded another file that works fine. No audio lag. However, the file that works I grabbed from my Kodak flip camera, the file in question is from a Flipcam. The file that works is a .mov. As I mentioned, the file with the lagging audio is an mp4. It seemed to work fine before in other projects. Also, I noticed that lately that Premeire is a bit slow. It wasn't as slow a week ago.
I'm using an iMac with a 3.6GHz Intel Core i5 processor with 4MB level 3 cache, 1 Terabyte of disk space, 4GB of ram, ATI Radeon HD 5750 graphics processor with 1GB of GDDR5 memory.
I'm not sure if there's some setting's that I'm missing or what. I'm not very clear on capture settings when I open a project. When I opened the project I was a little confused about what settings to use.
Thanks very much.
Jim

Maybe - any chance to check those files on a G4/G5/Intals Mac or a Windows PC? btw. at what speed is your G3 running?

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Video Lags Behind Audio in Preview Pane, Timeline and Rendered Video

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