My workstations are on P11 version 11.2.272 (64bit Win7Pro/Ult), and my Queue-only remotes are 11.2.5724 (64bit Win7Pro). Networking frames out via Queue works.

Look at your firewall's application rules on every machine. They make a distinction between Queue's rule for home network versus public network, for instance. So, make sure that Queue Manager, FFRender64, and Poser each have permissions both incoming and outgoing.

Join each computer to your same homegroup.

I also have the destination folder within a shared (read/write) folder.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5