alice-teacher Alice 3 Positioning of objects problem

[Margaret Meijers]

I teach Alice online to primary school students from many different
schools, and I am starting to think there may be an issue with positioning
of objects, but I'm not sure quite where the problem lies.   The issue has
occurred a number of times with students from a couple of different
schools.  At first I thought it was the kids positioning objects poorly,
but I'm starting to get suspicious that it's related to different computers
and versions of Alice perhaps?

What happens is that students (probably using a different version of Alice
3 to me) make an animation (they are very much beginners) and they send it
to me for assessment.
But for a while I have been suspicious that they are not seeing what I am
seeing as, frequently, objects seem to be positioned very poorly.  I have
attached an example, both the alice program, and screen captures of what I
see.  In the screen capture, the small thumbnail is from the Recent
category in File >Open and it looks ok, but when I open the animation, the
shark is sitting below the sand.  Other objects (eg the fish) that appear
later in the animation are in the correct place (or where I assume the
student placed it).
I have opened the animation on two different computers (one running
V3.1.81, the other V3.1.77), and I see the same thing on both computers.

So my questions:  Is there something obvious that I am missing?  Are the
students doing something?  Is it possible that it's a versioning issue?

Thanks
Margaret
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