random with no replacement for 3 pic is not working

This is an issue from 6 months ago . 3 pictures must simultaneously show, but this is not occurring consistently. Sometimes 2 shows and sometimes 3. I know this is a bug that was fixed in 4.08 but what can I do to fix in 4.07? My experiment has to run on 4.07 due to the need to use your SV-1 voice key.

I’ve tried fixing it with the random with no replacement & sequential but this is not working (experiment must be randomized). Help?