Artwork plugin of audio/deadbeef port doesn't show CD image files (cover.jpg, ...)
Hmm, I'm usually using version 0.6.2 and it displays cover art files just fine. I'd have to test 0.7.2 and upcoming 1.8.0.
Does the problem occur with local image files only? Could it be because some website which plugin used to fetch images from is currently down?
Also, you might find this thread interesting and/or helpful: https://www.linux.org.ru/forum/multimedia/14212758
I've rebuilt deadbeef once again, now it's OK! Closing the ticket.