Permissions Issue: FCP 11.1 / MacOS 15.4.1

MacBook M4 Max / 36GB RAM / 1TB internal SSD / 4TB external SSD

FCP 11.1

MacOS 15.4.1

FCP app resides on my internal SSD.

I save Library/Project on external SSD.

Project backups are saved on internal SSD in my personal profile.

I get Permissions errors when I invoke video operations (Balance Color, etc.), close the Project, then try to reopen it.

Solutions tried:

changing permissions on:

1) docs,

2) folders,

3) drives.

Help, please?

Thanks in advance for any insights or suggestions you may offer.