When you say "launch home media" are you talking about on the 922? I'm connected to the 922 via SlingLink and a router. The 922 shows an ip address and my firewall is showing the PlayOn server as active, as well as the program itself. I've reset the 922, rebooted the PC, nothing. I've got to be missing something.
Yes if you press Menu button on 922 there is "Home Media" icon in the Main menu. If you press select on icon to go in Home Media application. There you should see your playon server or any other DLNA/UPNP server running on the home network.
Basically Look at the images Scott posted you should see something like first image after selecting Home Media icon from the main menu.