Speedgrader appears to be working incorrectly. I have a rubric defined which allows me to re-use comments saved with each criteria. This is an assignment and rubric I have re-used multiple times. Today, when I selected a comment from the drop-down menu of "Saved Comments", the selected comment will not populate the "Comments" box. Further, I created a new comment and clicked the 'save this comment for reuse' box. The comment was not saved. This is repeatable in both Firefox and Chrome.
It worked just fine yesterday. One note, I obtained access to Design Tools for Canvas yesterday (it was already available on our access was granted after completing training). Perhaps there is a conflict? In the image below you can see that I have selected a comment from the drop-down, but it does not populate the Comments box.