v2002 is going back a bit so I'm not sure if that would be an old bug or a possible issue with your input or style file. I believe the IAT samples in the "5 - Other Features" sample folder uses this feature--i.e., requiring a correct response. Do those samples do the same thing on your system--i.e., end the session if you take too long? I do think there may be a difference in that the IAT does not force a correct response within a specified time frame. That may be the issue--it sounds familiar actually but not sure. If you change that 2500ms min-max value to "0-0" does everything run fine? We could also get you a current copy of DirectRT to try (no charge) if you'd like to see if that allows you to do this, i.e., to add a time limit to the forced correct response. Feel free also to zip and post your file here as an attachment--would be happy to take a look.