My colleagues and I are having issues using the new "average" Proficiency Calculation setting. When setting up outcomes, they appear as they should on assignments and on the teacher view of the Learning Mastery Gradebook, but not on the student view. 

On the student view, the initial "2 of 13 mastered" (for example) is visible, but if you open that dropdown to see which outcomes have been mastered, the screen disappears. Weird. 

I've double checked that using any of the other Proficiency Calculations (decaying average, most recent, etc) do NOT cause this problem, and DO allow students to see their mastery scores accurately.  It seems as though just "average" is the problem.

Any ideas or something I'm missing?

UPDATE: Apparently this is a known bug on Instructure's end. Seems like a glaring issue for a newly rolled-out feature.