I do have the original and have already switched back to original executeDRT file. So no worries there.

I have not tried with getting rid of the gifs, but will try tomorrow.

A couple of other pieces of information that might help. First, when it freezes it opens a tap that has a title "ActiveMovie Window" but when you click on that tap no window comes up. Second, we are running the stimulus presentation through a video splitter so that the images are presented on the experimenter's monitor and the subject's monitor. When I ran this with the subject monitor off, it did not crash. But, when I turned the subject's monitor on, then it froze. Before this, we were having problems with getting the image to present properly on both because the computer is new and it was set up for a wide screen monitor. We fixed that, but now we are getting this so I am wondering whether this might be cause by differences in resolution of the two monitors.

I am not sure if any of this helps.