Adobe Presenter Video Express 2017 - recording hangs at ca. 11 minutes

Hi - I'm recording both webcam and the screen at the same time on Adobe Presenter Video Express 2017, on a Mac. It hangs up about 11minutes 44 seconds into the recording. I used to fix this by uninstalling the software and reinstalling it and starting again but that's not working anymore.  My Mac is new (2017 Macbook Air).  Any ideas?