I use the watch.slingbox.com every day for viewing TV inside the house.
This morning, when I started the application, there was no volume, and the slider, favorites, and other icons were missing from the bottom.
I went through the setup again, and during the setup process, the volume came through just fine. When I finished the setup, and went back to regular watching, again, no volume and no slider and no channel favorites.
So the only way I can watch is in setup mode.