Hi,
I have a different problem but It may be reported in the same topic I presume.
After testing Corona a6 rc1, for c4d r15 and r16 on MAC OS X, I can report some bugs with the Corona VFB.
I use OS X El Capitan with a mac pro 2009 upgraded.
On both cinema 4d editions r15 and r16 the corona vfb doesn't allow me to zoom in my picture. It sticks on a low display resolution. In parallel if I open the cinema 4d render window everything is normal. But for example I would like to zoom specially for the light mixer tweeks.
I'll continue to try Corona in the next days. I'll adopt it in the next weeks because apart of this bugs It works really nice.