I used to be able to watch Mezzmo-served movies on my phone but no longer - BubbleUPnP no longer shows "Mezzmo".

I have a Nexus 6P running Android 7.1.2 and BubbleUPnP freeware 2.8.10 (and MX Player 1.9.3). My media server is running the beta 5.1.2 (but the issue I'm describing here was also present on 5.1.1; I upgraded because of the Windows Service issue with 5.1.1).

When I go into Bubble I can no longer see a Mezzmo entry in Library.

I can watch Mezzmo-served movies from two computers - one running XBMC and the other Kodi.

Any ideas?