Strange Masking Behavior in Section

[gregcashen]

I have a model that is experiencing a weird masking error in a section. I have attached an image. Any ideas? I cannot see what would be causing the model to disappear in such an arbitrary way?

http://www.zoogdesign.com/forums/phpBB2/download.php?id=2150

[PeterJ]

That behaviour can occur if there is a coincidental face, either a wall demolished and rebuilt, a linked model, or (not in this case obviously) two bits of topo intersecting.

There may be other causes.

[gregcashen]

Figures. I have none of those cases in this model. :twisted: