When I have a chance I'll see if I can find a thread that I recall and that may be helpful. In the meantime…
Are you using Computer Plus or manually configured? Do you have the same versions of OS, Compressor and Quicktime on each machine? Are you connected by Ethernet?
Post a screen shot of Qmaster Sharing settings window.
I'm using same versions for all OS (10.7.5), Compressor (4.0.5) and Quicktime (10.1) on each machine and all connected via ethernet. I've share the cluster node services to compressor for all across the MAC as screen shots below.
The thing is I couldn't see the available service node at Qmaster service browser. Not even the master controller 1. I'm lost right here.