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Videos presented in slow motion using builder view

Hi guys,

I have a problem with a decision-making experiment I programmed in PsychoPy using the builder view. Participants watch scenes from a basketball game (10 sec) and afterwards they must decide whether they observed a foul or not. My problem is that the scenes are presented in slow motion, although the original files are in regular speed. When I accelerate the speed of the videos using shortcut, the experiment runs fine, but when I restart my notebook the scenes in PsychoPy are again in slow motion even though the path is directed to the accelerated videos.
Has anyone encountered similar problems?

For further details:
OS: Windows 10
PsychoPy version: V2020.2.10
**Video format: mp4

I do not get an error message, the videos are simply presented slower than normal.
Any help would so much appreciated!

Take care,