No midi sound in C9, Mac

I’ve got a real strange problem on my Mac Mini. I use C9 with Superior Drummer 2 suddenly there’s no sound from a big project I’m working on (only with drums). All meters are showing sound except for the master output!

The same song works fine on my MBP, I’ve send that version to my Mac Mini, but still no sound??

I’ve tried to open another song, it works fine.

Anybody have a solution for this?


Problem solved! My son dropped by and located the problem. It was a limiter demo I had installed a month ago but not bought when the demo period ran out. It was still on my master output but not working of ofcourse, but that stopped the sound.