The error appearing on SpeedGrader is showing as "error occurred updating this assignment"
Not able to get a screenshot of the error though
Lydia, other people have been experiencing this error as well. Even if it says the comments you are adding aren’t saving, they are and will show up if you fresh the page.
I recommend submitting this to Canvas Support. To do this click on the Help link in Canvas and Report a Problem.
Retrieving data ...