Sure, lemme get it running.. Okay, reexported NFS and restarted JReceiver. Booted up the Rio and got the Rioplay splash screen. (Nice logo, BTW). I hit Menu, up pops "Audio Receiver" menu, push center button on Rio to select "Select Music". Source, "Rio Server", Another menu, Artist, Album, Title, Genre. Selecting any of these menu items brings a menu titled "Select Artist" with only one selection, "Play All". Any button press (including select) brings me back to the splash screen.

Edit: Oh, I'm running with JRec 0.2.3 and dhcpd on Linux. My current setup works great with the original client.