@bluedevil9754 said in Errors are logged to /dev/shm/runcommand.log after selecting default emulator:
Any leads into what I might be missing?
Yes, a couple
The N64 emulator is installed from within the RetroPie-Setup script, not with the procedure you described.
The Errors are logged to ... message is a generic runcommand information message and doesn't mean an error has occurred, but in the event of an error, this is where it would be logged.
RetroPie setup already sets up one of the N64 Emulators ( I think Mupen64 ), so you don't have to install anything, especially macOS binaries that don't run on a RetroPie. Make sure your ROM is valid and try removing any game resolutions you've set, it seems the problem is from your TV not accepting the resolution you set.