This is happening to me as well (with SSL). It started 2 updates ago... I was just holding out until this last update hoping it would be corrected. Absolutely nothing has changed (at least by me) on Sonarr... running the exact same settings. Not sure if they've changed something in their APIs. This occurs on the Upcoming and Missed tabs. When I tap on a show, the artwork is missing from there as well until I hit refresh, then it shows up. However, hitting refresh on the Upcoming or Missed tabs alone does not fix the artwork issue. I have not updated/modified nginx either. I've cleared app cache but have not tried a complete uninstall/reinstall. Couch Potato, NZBGet, and search integrations are working just fine. I can also access Sonarr remotely from a browser just fine as well: granted this is via login credentials and not the API key. Other than artwork, everything with the Sonarr integration seems to be functioning. Any ideas?