kamlooper,

There's our problem. You're using an older version of turbocad. It seems that IMSI doesn't offer v6.5 for download anymore. Let me know if you can receive a 7.5mb attachment via email and I'll send you a copy of ver 6.5.

Just in case you want to stick with ver 4, I'm attaching a copy of the ribs which I edited with ver 4.

Hope this helps.