Hi @GrahamBurns ...
By chance, do you know if the student is submitting the file to you as an extra attachment to the assignment? For example, if you had provided comments on an assignment that was submitted by a student, and then that student submitted comments back to you with an attachment, is that attachment showing on the right side of the SpeedGrader only and not in the main DocViewer portion of the screen where you are used to seeing the document? If that is the case, when students attach files in this way as part of a conversation with you, those documents do not show in the main portion of the SpeedGrader. Downloading is the only open as far as I know.
I'm not sure if this might be the case for you, but I thought I'd throw out that possibility. Let Community members know if you have any other questions about this...thanks!
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