Hi,
I just discovered a problem with the printrun functioning on a Mac with Mavericks 10.9. The new Mavericks version has a setting for each application that allows it to be put to sleep. I didn't know this about mavericks before I got it. Not a problem though. If you have the same problem, right click (command click) on the new printrun and go to
Get Info and check the box in the window that says "Prevent App Nap" . You will need to restart the computer in order for the setting to come into effect.
Hope this helps other mac users.
Cheers,
Rory