Hi there. I launched a Support Ticket in August 2015 (7 mths ago) where WPMU acknowledged an error which was logged for fixing.
This issue seems related, but may not be.
When a student is looking at their own units: the progress circle reports as 100%, even when a student has unanswered questions. Even when they have answered no questions in a unit, it still reports 100% complete.
I have granted Support Access. Can you please review this, ta.