Currently using the movie studio platinum trial and all seemed fine. Imported a m4v file with no problems.

The next day I try the same but with another m4v file. This time I get the green screen on the preview and every second of the video I imported. The same thing happens in the trial or Sony vegas pro 13. I even tried the 1st file again and I got the same problem.

Now I did fix it by disabling compoundplug folder. However it caused another problem. The preview window is now stuttering as if running on 5 frames per second! What can I do now? :S