I was experiencing crashing while testing this when trying to set the value negative. It turns out there was some bizarre bug in the UI. I fixed it for the next version 20.06. Here you can overwrite yours in share/shotcut/qml/filters/crop ui.qml (6 KB)
I modified your image with Graphic Converter by deleting 1 pixel across the width. The new image is now 974x808 and the problem does not appear anymore.
It seems that SC doesn’t like odd values.
You are reporting a different, old bug in the wrong context. This new UI file does not cause that. When this happens, you need to change a value to get it correct.
You can see in your screencast that it alternates between OK and not OK as you change the value for Right. Choose the closest value that is OK. I fixed the underlying bug (not in ui.qml) for the next version 20.06.
I’m on the latest Shotcut and I record let’s plays in obs on a 2560x720 canvas. I then crop it into 2 720p 60fps videos. Lately, shotcut has been crashing when trying to crop these videos. Could this bug have been reintroduced somehow?