@ Michael Hendrix: I just transferred the clip from my external harddrive to the internal one. Still the same problem.
@ Dennis Radeke: IS there a converter to convert the .avi into Panasonic P2?
I´m starting to give it up right about now. I´ve worked with Sony Vegas so far and didn´t have that kind of problems. Now I wanted to try out Adobe Premiere Pro and it can´t even get a simple .avi to work properly. I´ve imported the very same video file into Sony Vegas and it plays it perfectly – video and audio in sync, exactly how it should be.