create a file: "UPnPaddress.dat" in the same folder as the log. In it. in your case enter one line
192.168.2.2
I did that, and it seems to be working very well.
mp3 to TV > playing well and also showing correct filename
mp3 to SB > playing well and also showing correct filename
flac to SB > playing well and also showing correct filename
Even volume adjustment seems to be working, but a bit erratic. The volume level and mute icon on MB don't always match what really sounds after some fiddling.
On my TV, volume or mute is not adjustable at all by MB, but that's probably some setting or limitation on the TV (it gives a 'volume locked' message)
new error log has been uploaded
Let me know when you want to take this further and have me also try with ReplayGain, gapless, eq etc.
Hats off to you again!