I have an experiment that at various intervals presents video/audio instructions (.avi format). The instructions files run from 9mb to 25 mb in size. The problem is that the video begins lagging behind the audio as the clip plays, and as the experiment goes on, this gets more pronounced. I have the memory set to load the files before the experiment begins in the “options” menu, but this does not solve the problem. Any ideas on why this is happening?