Millisecond Forums

Today, during my first day of data-colleciton using inquisit 4 webversion in schools, we encountered a problem.
My experiment is a batch of 20 different scripts, some containing questionnaires, some containing for instance images etc. All students get the same script.

Computerscreens went black during data-collection, which could only be "solved" by pressing control+q to go to the next part.
This always happened at the beginning of the batch, but in different scripts (sometimes during the first experiment, sometimes second, sometimes third, but always within the first 10 minutes). The first scripts all only contain questionnaires.