After having selected a UPNP external player with "Choose Player" in MM 4.1.0-1685, the sound is correctly heard on the device. However, switching back to "Internal Player" produces no sound at all. Stopping and restarting the player does not work. Restarting MM does not solve the problem either. The *only* way I found to recover the sound on the internal player is to choose a second external player (*different* from the one initially selected), then select "Internal Player" again with "Choose Player". Sound is then heard on the internal player. I was lucky enough to have 2 different external players at hand.
Please help.
I didn't find the right solution from the Internet.