This is a new problem we have been experiencing in the last 6 months.  Students will send messages to instructors from classes which already concluded.  Usually, asking about their grades.  When an instructor goes to reply, they find they are unable because the reply buttons are greyed out.  

We have been able to get around this problem by removing or pushing out the course end date.  However, as of today, that is not working.  

Is there something I am missing?  Can this be fixed?  We have instructors consistently reaching out to us to fix this issue.