open -n .../blender.app open -n .../blender.app/contents/MacOS/blender
I also tried only
./ and tried to open the app manually inside the package contents, all with the same result. I also tried with 2.74, and the same happens. Oddly enough I am looking at a tutorial in which the guy has 2 instances opened on a Mac without much problem.
So, what's going on? If I have to make 2 instances of blender.app, it's ok, but how can I get the console window method to work?