There seems to be some inconstancy in how Category Totals are displayed to the teacher/student in regards to hidden grade items. For example: If I have an unhidden category which contains grade items (all of which are hidden) then the student will see something like this:
However if you log in as the teacher you will see this:
I don't know if this is the intended functionality but it seems a little confusing to me. I would think that either both of these would show the same thing OR the teacher should see the total and the student should see 0.00 (the opposite of the current functionality).