Occasionally there is a glitch where a student's assessment is showing as completed but on the teacher's end it is showing as paused. The only current solution for this is to wait for the engineers' overnight script to run and clear this. A great solution to this problem would be for a student's answers to be submitted automatically once the time window has closed. This would allow the student's answers to be viewable by the teacher and graded by the system.
I think I might say have the teacher side have a button to force submission. I use these mostly for formative assessment without much limitation, mostly I think kids are just closing their browser instead of hitting submit and if I can force the submission after the due date at least the "show results page only after..." function would work.