Mp3Tag corrupts my song files

All of a sudden, it seems that I can't change the tags on my song files. No matter what I do, the program corrupts my songs.

No matter what I do, the changes are not even visible, even tho the program itself tells me that the changes are there!

When I try to open the files, it just say that the files are corrupted:

"Cannot be opened"

"This file cannot be played. It might be because the type isn't supported, the suffix of the file isn't right or the file is damaged."

"0xc00d36c4"

Please have a look at the various existing topics for the same or similar issue:

https://community.mp3tag.de/search?q=0xc00d36c4

Of the various solutions suggested, what have you already tried?

In addition, I'm interested in where you got the files from or how they were created. It would be great to identify the root cause of the problem.