Hello @lsteele,
I suspect this is related to the recent changes to the DOAJ API:
Please see the forum posts here: New DOAJ website, DOAJ plugin does not work - #4 by rcgillis and New DOAJ API and DOAJ plugin - #2 by Marie-Helene (this one in particular points to a fix for the issue).
Please search for relevant posts prior to posting as it helps cut down on duplication and clutter in the forum.
Best regards,
Roger
Public Knowledge Project /Staff