A bit more info on my original post:
The students all have Mac laptops, except one who has a PC. Most of the Mac users AND the PC user have this problem. I have the exact same laptop and operatings system as several of the students and my arrows work just as one would expect.
We found the keyboard settings panel and there is no difference between what we see on the working and non-working machines' arrow key settings.
This is strange!
Moving 5-10 px is the default behavior if the user is depressing the shift key. I'd be curious to see what the behavior is for your laptops if you press the shift key - can you get your students to try that out?
That being said, we do test on a wide array of Mac laptops and have never seen that problem on our systems.
I was wondering if a caps lock was somehow playing a role, but I did look
at one of the student's machines and it did not seem to be turned on. Of
course, the really strange thing is that the arrow keys only allow elements
to move right and down (as I said earlier, the up and down arrow keys both
move the element down and the left-right keys move only to the right!).
What's very odd, is that of the 17 students, this problem is happening to
more than a dozen of them (and on the only Windows PC in the class). It's