After loading a print file and starting a print, a notification appears in bottom right of Print Monitor screen that says, "Load a model file or a verified G-code in the prepare window to begin a print". It stayed there the entire time the file was printing.
Please ignore previous comment, I posted to the wrong ticket. I was able to duplicate this once, when switching to the monitor tab as soon as adding a printer:
It looks like the slicing never completed for me, and switching tabs so quickly may have thrown something off. Once re-positioning the octopus everything sliced fine. While trying to duplicate the above, I was unable to see the failure again: