I have randomly experienced this same problem with many different versions of VEGAS Pro and VEGAS Movie Studio, over the years.
It is a Windows Files Permissions problem.
The video you linked to, shows the same solution that normally works most of the time.
However, I also discovered that when I did a clean install of Windows 11, I have never experienced this problem ever again.
Reinstalling Windows, did something to my computer and now my files permissions work 100% OK in all versions of VEGAS, all the time.
Moderator Edit: I edited your original message and posted a direct link to the video with the solution.
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