Reason for the crash is still unknown. Here is step by step work around for this specific problem:
- Split the first element. Give 0.1 mm length for the new first element. Short element tricks ISOGEN not to draw extra line. 1 mm long would draw.
- Move restraint to second element first node. This means that the restraint is 0.1 mm from the original position
- To show restraint node number you can still keep it in the original first node if you do not recalculate. On a drawing node number seems to be connected to the restraint

Generate stress ISO. Should work.

Alternatively if you have this issue you can try building the model with that 0.1 mm long element. Just do not put any restraints into the first element.



P.S. Drawings look substantially better than 5.0 version