Interesting – and it sounds like you were able to track it to articles creates with the QuickSubmit plugin, @UBWolf.
Could one of you update your QuickSubmit code to the current master branch code at GitHub - pkp/quickSubmit? [General note: this is often not a recommended thing to do, but at the moment the 3.2.0 release is very close to the master branch, so it’s fine.] Please confirm whether new submissions created with the plugin have the same problem.
Meanwhile, @UBWolf, if this is just a small or test database, could you send me a copy? I’d like to confirm what it is about the submissions that causes problems with the Recommend By Author plugin, so I can make sure they’re fixed up on upgrade.
Regards,
Alec Smecher
Public Knowledge Project Team