I installed R 3.2.3 and MRO 3.2.3 on OSX 10.11 and I got error message:
Microsoft R Open[43883] <Error>: CGContextSetFillColorWithColor: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
And it seems that r console don't detect MRO. How to solve this problem?