I have the same problem, reported it sometime ago.
Only had time now to look in the VRaySpawner log file and saw the Alert that it can’t find the VRaySpawner.ini - Hope this give enough info to the team to steer us in the right direction.
When I render thru DR, it only shows my main/client machine’s ID in the buckets. It never shows my render slave machines ID. I have VraySpawner on on the slave, although the max file’s shows up as UNTITLED not VRAYSPAWNER90, as it’s supposedly should. In setup under DR, it shows both computers IP addresses too and the resolve fine.
I have run a Net Render with backburner and it renders fine, but once again I cant tell which machine is doing what or if the slave machine is contributing at all.
Why is this so difficult to understand? I cannot DR to work right.