Yeah, forgot about the warnings, and not much point in pushing a whole new update to fix just that.
As for the other, I’ve never seen it and I only work with it from C++. It has to be specific to something you’re doing differently that it’s not liking but I don’t know what it would be. I’m still on 4.15 for work project, but work with 4.16 and 4.17 almost daily now working on the new RMC. Not sure what would cause that though. For materials the RMC should be setup almost identically to the PMC.