bug with crash, maybe hidden faces or normals

[micheus]

It is not too hi poly, IMO did not seem a case of 'overload'... But who knows . The model has 2681 polygons.

Sure. I just asked because with hi poly counts sometime we get strange behaviour. Also, because to try reproduce the situation is a good idea use similar conditions.

Anyway, today I had some time to try it and we really have a bug for this situations where we have hidden faces. I should say that it's my fault, since I added the "edge influence color" to Tweak.

As a workaround you can access Tweak Preferences dialog and disable the option Show Magnet Influence - something that was suggested by Fonte Boa (if I'm not wrong)