I am having a similar problem: Roon quits as it is opening. I receive an error message stating:
Terminating app due to uncaught exception ‘NSInvalidArgumentException’, reason" ‘-[NSOpenGLContext pixelFormat]: unrecognized selector sent to instance 0x618000230120’
I have no idea what this might mean. I tried redownloading Roon, restarting, clearing out the file folders (as per Patrick’s fix above). Nothing seems to ameliorate the problem.
I am running Roon on a MacMini running OS10.9.5. The Roon website states that the OS should work, but I’m wondering whether Apple’s move to 64-bit only might be a source of the problem.
I should say that the problem surfaced suddenly a couple of weeks ago. Nothing changed on the computer. It is singularly devoted to running Roon and not used for anything else.