My setup is a Windows 10 system running one client and one master, and two Linux Mint systems running as slaves. Four GPUs per slave.
As far as the network setup goes, everything seems normal. The clients are able to communicate with each other, anyway. Problem is, when I click Animation on Network in the client, the render viewport starts empty. Then, once the 'results' start coming back, the frames are pink, and look more like what you would see when using the viewport during mesh construction. There should be an image background in the world, but that isn't visible either.
I've made sure that cycles is selected in the client configuration, and all the render settings such as sampling were configured in the cycles mode before switching to the network render mode.
I've tested this with both animation, and with a simple single frame render. Same results. Everything renders fine under cycles without the network render.
What am I missing? And is there any other information I should provide?
EDIT: I've noticed some other questions here getting answers about seeing pink when there are missing textures. I suppose I should point out that everything in my scene is currently just materials. The only image used is for the world.