What is your Shotcut version (see Help > About Shotcut)? Is it 32-bit?
22.04.22
Can you repeat the problem? If so, what are the steps?
When I apply “Size, Position & Rotate” video filter and add some keyframes of the size & position, it seem like that the first keyframe was locked in 00.00.00.01 frame, even if I click the “Use keyframe for this parameter” button in other frames. And then when I try to add and edit other keyframes, I was editing the first keyframe instead of the others.
This problem didn’t happened in the keyframe of rotation, only size & position.
Thanks for the report and testing on this. This is a pretty major regression and we might need to issue a re-release.
I think I have found the problem, and it could affect any filter that uses the rectangle VUI and keyframes. Would anyone be willing to test all the filters that use the rectangle VUI and report back which ones are broken?