The part 6577, "Technic Bush 1/2 Type 2" is one part where I first noticed it. You can view it at:
http://www.ldraw.org/cgi-bin/ptdetail.cg...s/6577.dat
Even if you remove the extra edge lines from the part itself there will still be some unwanted edge lines from the primitive.
http://www.ldraw.org/cgi-bin/ptdetail.cg...s/6577.dat
Even if you remove the extra edge lines from the part itself there will still be some unwanted edge lines from the primitive.