Here is the sequence that I use to stream from a Win 7 desktop running Foobar2000 to the RR2160:
1. Turn on the 2160 and set it to DLNA-DMR. Wait until it initializes and says "Net Successful".
2. On PC running Foobar2000: File > Preferences > Playback > Output > Device: choose the RR2160. Click OK.
3. Start playback in FB2K.

I usually observe the Console log in FB2K to be sure that playback is progressing. If the RR2160 does not say "Net Successful" or FB2K Console playback time does not progress beyond 0:00, I know there is a problem, usually solved by shutting down the 2160 and turning it back on.

YMMV