Serial Monitor doesn't work with Arduino M0 - IDE 1.7.8

Sorry for bothering you, but we are two people with the exact same problem and already have been looking in all forums and Internet sites, but still have now working Serial Monitor.
So we have tried to start the Serial Monitor with the easiest examples, but it just doesn’t give back anything with Serial.println() . All we figured out is, that there were some issues going on with the latest Version and the new board Arduino M0. So is there anybody who already has a solution for that? Would be great!

I suggest that you contact arduino.org for support. The IDE version is not an arduino.cc product; neither is the M0 as far as I know.

You probably have a better chance there.