Discogs : 401 error

my scenario:

  1. I used the discogs tagging feature in Mp3tag 2.71 for many months without problems.

  2. I suddenly receive this error: "Failed to authenticate using OAuth (1)."

  3. I attempt to use the discogs tagging feature in foobar2000. I receive a similar error: "(skipped) Error: Authorization Failed (401) [Is OAuth working?] - (url: http://api.discogs.com/oauth/request_token)"

  4. I attempt to fix the error by deleting the Mp3tags application from my discogs settings.

  5. Step 4 fails to fix the error.

  6. no dialogue within discogs settings to re-authorize Mp3tag. It just seems like the messages are blocked...

  7. musicbrainz, amazon and freedb tagging works fine.

I followed the steps in this thread found that my discogs.src file already contains the suggested settings. also tried combinations suggested by other posters:

[WordSeperator]=%20
[Encoding]=url-utf-8

[WordSeperator]=%20
[Encoding]=utf-8

[WordSeparator]=%20
[Encoding]=url-utf-8

[WordSeparator]=%20
[Encoding]=utf-8

OAuth error still occurs.

I created a new discogs account, to see if my old discogs account was causing the error. I tested the discogs tagging feature in Mp3tag, while logged into my new discogs account. once again, I get an OAuth error.

more details in this thread:
Mp3tag v2.71 / foobar2000 - discogs tagging not working: "Failed to authenticate using OAuth (1).