Hi again.
I thought I'd figured this one out, but it appears not. When I launch my DRT program, the first screen should be instructions. Last time I tested this, a) we had to set screen resolution to 800 x 640 to get anything to happen; b) about half the time, the screen that should have been instructions was blank. I would go in and reset the position parameters from 0,0,1 to .2,.2,1 and try it; it would fail again; I'd set it back to 0,0,1 and then it would run. But only for a couple of trials and then it would fail again.

Today, I'm not even getting that, but most of the time the first screen simply has the phrase "instructions.txt" appearing in the middle of the screen. It will respond to a spacebar pres, which is the keystroke programmed for the instructions line in the input file.

Note that I have changed the videos folder to a stim folder as you suggested, and I've changed the video file names in the input file to remove the .avi and the folder path reference. However, I retained the "_" because without it, DRT treated those file references as .bmps. Having made these changes, now I see no evidence of the videos at all--no flash, as I saw before; just nothing.

Help!!!