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Experiment freezes in moviestim on pavlovia

URL of experiment:

Description of the problem: I run an experiment on pavlovia about three month ago. When I now run my experiment, it randomly freeze at the end of a moviestim routine. The experiment runs smoothly during sampling and was not updated during this time.
On the contrary, when I run the same experiment in local it runs smoothly.
What could have caused this problem? Were there any updates to the pavlovia platform that may have caused this problem?

I have the very same problem. Last time I piloted my experiment (15 dec 2020) it ran smoothly offline & online. The same (online) experiment now freezes randomly at the end of a moviestim routine. All videofiles are .mp4 & I created the experiment using PsychoPy v2020.2.10, MacOS Catalania version 10.15.7.

Has anyone been able to figure out what the problem is or how to solve it?