I should have mentioned this a couple weeks ago, and am surprised to not
see if posted yet.

When I install 6.0 and select a Live 365 stream, pressing the PLAY
button does nothing; there is no way to start a stream.

I just installed the 12/30 nightly 6.0 build today and it still does not
work. Backing off to the 12/30 nightly 5.6 version works fine.