This is the first I've seen this, but I'm working with a faculty member who has a Discussion (a group discussion, if that makes a difference here) that shows No Longer Available. However, there are no Until Dates associated with any of the Assign To fields (instructor panicked after angry student emails and broke out several students into individual Assign Tos).

I worked with Canvas Support and they seemed completely stumped and want me to start changing dates and changing them back to original values--each of which would trigger a student notification so I'm hesitant to do that.

Has anyone run into this before? Any advice on what might be causing it?