Thank you, Bert. I'll try what you're proposing.
On Mon, 26 Nov 2012, Bert Freudenberg wrote:
It would be interesting to know what exactly happened - seems to be an unfortunate mix of textual and tile scripts with and without arguments having the same name as some variables that were added / removed in a way to confuse the system.
There weren't any textual scripts involved. The students are doing tile-scripting only. Having variables and scripts with the same names is a typical mistake among them.
Markus