Between groups stops after 8 stimuli

[ijohnst]

Hi,
I've set up 20 stimuli and 20 questionnaires, one for each stimulus.
The stimulus/questionnaire pairs are numbered 1,1;2,2; 3,3;...20,20 in the BGR column.
The random function works fine, but only 8 stimuli/questionnaire pairs are shown when I run the experiment. After that, the 9th stimulus appears and then the screen goes blank.
I've run it several times; all of the stimulus/questionnaire pairs are available to be randomized, but only 8 run at a time.
Plus I never get to my concluding instructions.
If I run the experiment without the BGR function, the same thing happens.
Anyone have any ideas?
thanks,
Irv