A quite simple model made out of three classes and one attribute leads to a crash of the DATEX tool.
In the moment it's not possible to attach files here, I will supply some graphics later.
I sent all source files to Jonas Jäderberg to evaluate this problem.
Introduced more arrow handling. When this occur a message is displayed saying that the model cannot be displayed and the exception.
(this was a model which had attributes that had a data type that is a class, that is not allowed)
Will be released in version 2.3