Hi Jacqueline,
That is very unusual! Out of curiosity, have you tried resetting the student view account? When you go to Student View and have the pink bar around your screen, at the bottom there is a Reset Student button there you can click.
That should set things back to normal (and will clear all the assignment ha that the test student has made.
Also, are you finding this happens only in a single course or all the courses you are a teacher in?
While these are the steps that I can give you from a generic level, if you click on the 'click here to tell us what happened ' link if you do face the problem again, Canvas Support will get a notification about exactly what happened, including error logs that we do not have access to for your instance, so that may be a faster option to get help (as they can see the error message that the system logs behind the scenes when you get that message).
I hope that helps!
Stuart
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