Jason,

to answer your questions:

1) The order is: practice congruent, test congruent, practice incongruent, test incongruent. I am running them as part of a .que file, with 'filler' instruction pages in between, to give DirectRT enough time to close the previous file before opening the next one (we previoulsy had problems with this issue, too).

2) Each and every file I attached produces the same problem. It is opened and then closed one after another (with the fillers in between, which are displayed correctly via MediaLab) without displaying any of the trials and also without providing error messages.

3) Yes. I use the same constellation that works fine for another task I programmed in DirectRT, but for this task I programmed it does not work out.

I can provide you with alle the files I use, if you need them.