@mitcorb said:
On first glance, this image suggests the Clipping Problem. There may be other issues such as non coplanar edges and such. Here is a link that may be helpful on Clipping: http://support.google.com/sketchup/bin/answer.py?hl=en&answer=36261
There appears to be no permanent cure for insufficiently prepared source material.
No I know this problem but it isn't so.
thanx anyway