This latest Ultra update seems to be plagued with playback issues. Everything was working pretty well on my two Ultra's [and WiiM Amp] and after updating the Ultra's yesterday, Ultra playback is basically broken (doesn't matter what streaming service). Half the time it doesn't respond to the WHA, you select a track on WHA and the album art may or may not appear but it never plays or frequently when you select a track, instead of playing that track, it reverts to playing the last played track.
It's bizarre, as it was solid with the previous Ultra update, but practically unusable for me now. I've opened a ticket.