I have the same seemingly inconsistent results, but I think there actually is a consistency. I get the Bad HTTP Status Code if the entry on Discogs has an image, but I get a good connection if the entry at Discogs does not have an image. Now I have tried this only with the entries for Jackie McLean (but that includes several entries where McLean is just a sideman so the main Discogs entry is something else), so I would be interested if others are getting the same. You can check whether the particular entry on the OCD list has a Discogs image by using GoTo. It will go to the Discogs entry - which suggests the connection to Discogs is okay - and you can then tell whether there is a Discogs image. I should add that I have no idea why this is happening and not a clue on what one might do to solve it (and whether it is an OCD or Discogs problem).