Wonderful, another marvelous mystery file! Opened up the trusty (cough cough) MacBook Pro just now and when I logged in there was a message balloon telling me that I had problems the last time I shut it down. I used it briefly last night and there were no problems that I knew about. The message gave me the option of waiting 60 seconds for the machine to start or if I wanted to restore the session from the last time it was on I could press Open. Of course I pressed Open.
What the heck is DuetActivityScheduler ?