Hi. This seems to be only on maya 2018. I tried maya 2017 and it works fine. If I file save as from the render view it's fine. But any time I batch render all objects besides the background are invisible. I can work around it for now by exporting scene to FBX, bringing it to maya2017 and rendering there.
My setup is
Core I7-3770 @ 3.4ghz
AMD Radeon R7
Win 7 64bit
Thanks. I like this renderer a lot!
I've had this happen just today. It seemed like when I added it to a visibility layer i(not render layer) made them go invisible, but only one or two objects. It might be a memory issue.