element factory anyone?

Hi all,

As part of a lecture program, I've used Markus Voelter's tutorial from the Language Workbench Challenge in 2011 for a few years now (see attached PDF).
This weekend, I was migrating it to MPS 3.1, and found that I couldn't get the element factory to work. Somehow it didn't see the types I defined in the language. Not sure if I did something wrong (my students will prove that later today), but I was wondering if anyone has (had) the same experience. Documentation of MPS is not complete in this area, which doesn't help a lot either...

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