I have recently purchased a Slingbox M2. I have it installed at my daughters home. At my home, I have a Solo. I don't know when or how, but my Slingplayer (web version) when connected to the Solo has no sound. When I connect via my cellphone using the Slingplayer App, I get sound. If I connect to the M2 (located out of state) on the Web slingplayer, I DO get sound.
I am also getting a disconnect with my local Solo, even though it is connected directly to the internet and I have decent speed.