Mp4 Video messes up preview

I'm evaluating Captivate, and working with the trial version. I created a software simulation with 24 slides. Five of these slides are quizzes. The preview works perfectly until I insert an mp4 video. Then, when it gets to slide 7, the graphics in the software simulation begin to look choppy, as if I were having memory issues. You can see the text being entered into a field, for instance, but you can't see all of the rest of the screen. The audio from the mp4 file periodically skips.

I've tried it without any other applications open, but it still does this.

Is there a setting, or something I should do to improve the quality of video presentations?

Thanks!