If MED crashes then it is probably MED. Even if your model file is corrupt then a smart exception treatment should save MED from crashing. Every modern programming language supports exception blocks to catch such problems.

But unfortunately this happens not all the time so you cannot send the model to conitec support.

Strange thing, indeed.

I also experienced some crashes in WED / MED especially when another program created a DirectX / OpenGL instance and I switched back to MED / WED. But this happens when you work with more than one tool.

A crash is always bad and should not happen.