Have you tried checking the "Bind all" box under the network rendering tab of Octane inside C4D? Perhaps it's not actually connecting. Also check the network machine to make sure it is actually selected and connected.

Thanks for the reply! I did see the new "Bind all" option in the new one, which ...

Hey, something weird has happened this week with my network render setup. It's all been in working order until a few days ago. I noticed my render node wasn't actually being used, even though it was online and connected. I did a few tests to find out what it was, and it turns out it stops working at ...