Is the student perhaps trying to drag into a Smart Collection (not possible) rather than a Standard Collection?
No. We just did a "GoToMeeting" meeting, and I watched her try and move an image on her computer, and then she gave me mouse and keyboard controls and I tried to do it myself – no luck. I could select and image – I just couldn't move it. I also did a separate test to see if clicking on the circle top right does, in fact, put the image in a Quick Collection, and that function did work just fine.