Fixed issue for me also. Thanks!
Jul 13 2019
Jul 12 2019
You are misunderstanding the issue. The Cycles render engine basically DOES NOT EXIST in any form when I run the release candidate for Blender 2.80.
The settings page shows a header Cycles options but nothing else--the next line in the System settings is the header for Memory & Limits
The BETA 2.80 from two days previously--2019-07-09 allows me to use Cycles with the CPU. The settings page shows 'NONE | CUDA | OPENCL' settings under Cycles render options,
even though the CUDA and OPENCL options are not available for my Mac configuration.
The Release Candidate build for 2019-07-11 has no options for using Cycles whatever on my Mac.
This is a new problem that just appeared in the last two days.