URL of experiment: https://run.pavlovia.org/kerblooee/perky_test2
Description of the problem: I had made my experiments in PsychoPy late last year, using various 2020 versions of PsychoPy. Last month or so some of them stopped running. So I copied all the files to a new folder and created copies of the experiments so I have “perky_test2” and “perky_test”, with all the same files and code, except “perky_test2” was set to a 2021 version of PsychoPy. This worked for a couple of weeks, and now the 2021 versions of my experiments are showing blank screens, and the 2020 versions are working again. What is going on?