Failing to write data...please help!

I have a Media Lab experiment programmed with one instructions .que file followed by one Direct RT .csv file. Both files are running just fine in the experiment, but data is not being written for the Direct RT portion of the experiment. The "block" column in the .csv file has "1" entered for all trials to be written, but the trials are not being written. When I say not being written, I mean it's not creating a data file for Direct RT, and so there are no spreadsheets with individuals' data either.
Please advise as to what we might do to fix this problem!

- UPDATE!! I think we have fixed the initial problem. Participants have to complete ALL trials before the DirectRT data is written. Is there any way to get around this requirement, i.e., data is written even if some trials are left blank (for instance if a participant didn't complete the study)?