Project video not visible anymore on an in-process-project

I was working on one specific project with 12 video tracks, without any problem. All of a sudden, Project video cannot be seen on the screen anymore while it was ok so far. Source video can be seen, no problem.
I opened old projects with no problem, video can be seen on the screen.
I did reboot the PC (windows 10), no effect.
Can someone help me understand what happened?
Thank you.

Without seeing the log I doubt anyone will be able to help.

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