When students open an assignment or when teachers create an assignment (or any course material), a pop-up window appears. However, that window is stuck in the middle of the screen and you cannot move it. I've found this to be troublesome because I often want to refer back to something on the course page.
When students go to submit their assignment, they cannot refer back to the assignment, all they can see is the window where they submit the assignment. I've had students ask for a way to view the question they're answering. I have to tell them to copy/paste the question into their answer or they have to open a new browser tab to go back and forth between their assignment submission window and the question.