Hi Elena,

You can also remove the teachpack from column one. It is, however, simple
enough for students to only add the teachpack in column 2. Once you add a
teachpack,  it remains added until it is removed. My first year students
run DrRacket without removing the teachpack all semester.

Marco
 On Sep 6, 2013 10:42 PM, "Elena Machkasova" <ele...@morris.umn.edu> wrote:

> Good evening,
>
> this may've come up before, but I looked through the last few messages and
> did a bit of searching, and couldn't find anything about this problem. My
> apologies if this is already a known issue.
>
> When DrRacket is installed, it comes with 3 pre-installed teachpacks,
> including image.rkt. However, image functions (rotate, square, etc) are
> undefined. Installing the teachpack from the middle column in the "add
> teachpack" list fixes the issue.
>
> However, if the user then tries to add the teachpack and happens to click
> on it in the first column, they get an error message "module: identifier
> already imported from a different source". The solution that seems to work
> then is to clear both teachpacks and then install the one in the middle
> column.
>
> This behavior takes place for both Racket 5.3.4 and 5.3.6, for Windows and
> Linux (Fedora 18). I don't know if it's happening on a Mac as well.
>
> If there is a plan to fix it in the next release, could you let me know?
> We might wait a couple of weeks to upgrade our lab to 5.3.6 is we can get
> an upgrade with this issue fixed.
>
> Many thanks!
>
> Elena
> University of Minnesota, Morris
>
>
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