if a model pair causes a crash i would need it for investigation.

does anyone else have crashes? (except the one when closing the engine!)

(both models need the same amount of faces, the vertex positions have to be exactly the same and the corresponding faces must have the same vertex order. maybe i forgot some check to avoid a crash if one of these isn't the case.)

...
btw. you can comment out all export and import functions since they probably aren't needed anymore.