Download DJ music from a company called Promo Only.
Edit tags in Mp3tag. Save tags and add to library.
Last week, the files started showing up as bad tags. I have reached out to the source company and they report no issues.
I have rolled back the versions on both download program and editor, as well as using different Windows OS. I downloaded another tag editor to see if those were read as bad as well, but they looked good.
Please carry out the steps asked for in this thread:
esp. the part that deals with the integrity check.
If the files come out flawless after the check with the suggested programs, we have to see what to do next.