@jonathan.kominsky it appears that there is a common issue with the code command in not terminating a loop (Loop.finished=true works offline but doesn't work online). I might just have to re-code my experiment to get around this issue, though that would muddy my ability to draw some conclusions that I had hoped to be able to differentiate between.
I had an idea as to why the Video Test study may have worked when my actual study did not; could it have to do with the fact that my actual study uses key responses that are triggered to start/end by one another?