Save preferences didn't clear anything on mine. I tried it. (on a dummy course!) I was using Firefox.
Save preference saves your quickgrade setting (yes or no) and how many students you want listed on a page. It shouldn't clear any values entered in the grading portion.
Does this happen on multiple courses? WIth multiple browsers? With multiple sessions?
Very strange!
atw
Assignment
Assignment module won't save comments and grades
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