Units showing as available in the Course Outline

The course I have been developing over several months in CoursePress Pro is behaving strangely. Earlier today a Unit lost all its content (this is covered in another Support ticket - I am attempting to recreate the content - but it appears that the Unit may be corrupted - I previously had 8 mandatory questions, I have added them in again and now when the Unit is accessed by a student is says 0 of 16 mandatory elements completed - but there are only 8 mandatory questions.

Also now when I look at the Units page it allows me to access any unit despite the two options in the Unit settings selected. (User Needs to answers all mandatory... + Unser also needs to pass...)

This functionality had been working perfectly up until today.

I have deactivated all my plugins - and still get the problem. Can you please help.