Well it should work with 1359 as well, chec kthe nightlies site for the changes /bugfixes that were made.
Anyway, in the firefly control panel you can see the number of songs etc.
What deffo should be possible is to open iTunes and look for “shared” music, that should display firefly.
Should even work on the same computer.
Maybe you still have some firewall/network issues, although its unlikeley.
The RSP Plugin for the soundbridge comes with firefly. Im just not sure wether its activated by default. I think you can set that up in the firefly control-panel thingy.