Hello,
Same for me corona RC3 cinema r16, Mac OS X Sierra. RC2 was unstable but I was able to make some tests. I installed Rc03 today in ten minutes I had to force to quit several times c4D. I'll try tomorrow on Mac OS El Capitan.
Few bugs I noticed : extreme slow down for material preview with Corona AO in diffuse slot.
Freeze after stopping render.
Freeze when tweaking the materials in the material editor.
I'll reinstall RC02.
Regards.