Program crash source code tab of class properties in classdiagram (#31)

In the properties screen of a class in a classdiagram --> when I try to put some text in the textarea at the sourcecode tab, the program crashes.

On my laptop with win 7 home premium it crashes immediately and windows starts to search for a solution in contrary to my desktop where windows 7 ultimate tells my that 'Software Ideas Modeler has stopped working' and offers my the options to look for a solution, restart the program or debug it.