I have 4 class sections cross-listed and I can only access 1 section through speed grader in a discussion post. I have the discussion set up in student groups according to sections. 

When trying to access speedgrader through the GRADES page, I get the following message. 

 When I'm in SpeedGrader and try to switch over to another section, I get the following message:

Is this because the discussion is assigned to Student Groups rather than sections? 

Any help would be appreciated.