We have a user that keeps getting this message when working in families. I was able to repeat it once and only once and i remodeled his family so it had less voids and extrusions and it did not crash. So he began modeling this way and still was able to get this fatal error. The most recent family was 15 pieces and 282kb. I've attached 2 images one shows the error the other is an image of the object right before it crashes it begins to look see through, in which case he said he knew to save and exit. You can see it is in shading with edges mode and looks like wireframe. Is anyone else having the same error or have any ideas what this could be?