The file names have been changed to uppercase letters

Excuse me, why are all my file names changed to uppercase letters?
Includes files and folders.
It was restored after reopening Directory Opus, but it became uppercase again after a while.
My English is not good, please help me, thank you.

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Your licence probably got corrupted. Installing the latest version of Opus should fix this.

Check here, if you also need to install the certificate again: