BubbleUPnP updated to version 3.5.6 a couple of days ago, on a Samsung Tab S6Lite, Android 11. In the morning I bring my PC out of hibernation. It has Minimserver installed. I bring up BubbleUPnP on the tablet, and it has lost its recognition of the Minimserver library. The BubbleUPnP scan does not find it.
(The PC and the tablet communicate through our wi-fi network.)
I go the PC and do a Minimserver rescan, which essentially relaunches the program. The problem remains.
On the tablet I go to Settings | Apps | BubbleUPnP and force a stop, then bring up BubbleUPnP again. The problem remains.
I do a Restart of the tablet. Then BubbleUPnP finds the Minimserver library.
Maybe the new version has a bug, or maybe there is something else the user needs to do one time in BubbleUPnP after a version update.