I occasionally would have trouble getting the screen to swipe, but now it's almost impossible. I have to select "Done" after each student which defeats the "speed" part of speed grader. Also, there are annotation tools on the top of some assignments which I can select and unselect to override the lack of swipe (it then works) but they are not on all assignments. 

I hope this is an error as this was one of my favorite features as it really expedited my posting of grades.

Thanks!