Don't know if anyone suggested this but Props should have a Re-Name Session selection in one of the pulldown lists. Preferably where the Save As selection is. When you don't really have the final name for a track you're working on, you should have the option to re-name it with or without Reason making a new session file. Sometimes I make tracks and name them but if lyrics and melody are written to it, the tracks takes on a new identity and probably a new name. So when I re-name it, it makes a new session file. Now you have the original and the new one. Just a thought.