Canvas is currently encountering problems rendering assignment submissions in Speedgrader. You can still download assignment submissions, but SpeedGrader displays the error below.
while(1);{"errors":[{"message":"An error occurred.","error_code":"internal_server_error"}],"error_report_id":}
We have reported this issue to Instructure, and they have confirmed this is a problem and are working to resolve it. We will post updates to the Canvas at Penn blog after we receive them.
Last Updated: 11 Sep 2015