CoursePress Pro - not able to duplicate a Course

I am trying to duplicate a course but it appears to time-out after a short period of time. I get a blank screen and have to log back into my WP site and then it seems to only partially duplicate the course - The course I am trying to duplicate is made up of 10 units and when I try to duplicate only 2 appear in the copied version

I urgently need to duplicate this course so I can make it available ASAP.

Please tell me why this is failing

Tony