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From Blender for Architecture
Submitter, please provide the revision of the blender build that you use (inside blender, click "help" then "about blender" and copy the code after "Rev-" at the bottom of the windows) When possible, please provide a link to the buggy blend file (find some site to host your file like Box). A picture is also sometime better than many words
- revision 16 058 (8/12/2008): bug related to the normal calculations which appears when a nurbs surface get closed