I bounced all tracks. I also archieved all input for this bouncing, because it is not longer needed. So the only "active" tracks are the "audio files" as a result of that bouncing...... and suddenly my Audio engine refused to work.
I really searched for the reason for more than 4 hours. Found out that at least one midi track playing thru ARIA must not be archieved. Isn't that strange?
Any comments on this?