Can't get movies to play

[Cynthia]

[edited from support email]

I had an experiment set up in MediaLab that involved playing a movie. It was working fine until this morning. Now, when I run the questionnaire file, instead of the movie, it shows just a white screen with a horizontal line where the movie should be. The problem does not seem to be with the movies themselves; they play if I just open the file outside of MediaLab. The trouble only occurs when they're in MediaLab. They are .mov files, but I've also tried converting them to .mpg and some other formats, and the same thing happens. Thanks for the help!

When you say they play if you open them outside of MediaLab, do you mean with Quicktime, the Windows MediaPlayer or both?

They wouldn't play in MediaPlayer or Quicktime. But I actually just figured out the problem. It turned out that two users were logged onto the computer at once, and when I logged the other user off, the videos worked again. I'm not sure why that made a difference, but it's fixed! Thanks for the response, though!