We need to know a lot more if we're going to help you.
What version of Premiere Pro? What operating system? What kind(s) of source footage? Has this ever worked before? What other software are you running? Do you have any third-party effects or codecs installed? Tell us about your computer hardware. Are you using Mercury Playback Engine GPU Acceleration?
Sounds like a field order issue. More info asper previous post would help with solution.
CS5, Mac OS X v10.6, non-camera footage. Just Photoshop, QuickTime, Photoshop Elements, and DVD player working in the background. No, I don't use Mercury.
EDIT: Safari, Firefox, Preview, iTunes, Word, the Terminal, and CrossOver.
Can you upload some footage so we can see the problem directly?
It's OK, I got it all under control. I fixed it.
Can you share what the problem was, and what the cure was?
That could well help another editor in the future.
Good luck and TIA,