Discogs authorization code not "sticking" in 2.90a

Since I updated to 2.90a, I'm prompted for a Discogs auth code every time I try a lookup on Discogs. The lookup works after I enter the code. The application is registered with Discogs. Is there a config file or or registry key where I can save the code? Thank you.

Do you get any other error messages that the configuration file could not be written?
I suspect that the owner-id of the data folder and the user-id of MP3tag do not match (any more).
You would have to change ownership then.

No error message. I tried uninstalling and reinstalling MP3Tag. We'll see if that works. Thanks.

Are you using this from two different machines?