Duplicate Course selection does not duplicate units - lost duplicated units

I used the duplicate course option in order to create a slight variation of the iVow course that has been published for a version for engaged couples. I had been working changing over the videos and course content for this version and then all of the units were no longer visible. After trying to duplicate the course again to start over, the course description pages are duplicated but no units are.

Not sure why this occurred unless due to an update to the Course Press plugin caused it.

Still need to duplicate the units without having to start from scratch on it. Please advise.

Thanks,

Wade Jackson