Having an odd problem with a boundary surface that is currently built OK,
If I edit the boundary and choose OK without changing anything, it fails to build - attempting to recreate the surface just gives me a please check input curves. I can't understand how it's successfully built, yet won't rebuild in the same state!
Anyone have any ideas on this one? Unfortunately we cannot contact the original contractor who built this surface...
Without seeing the file it is hard to troubleshoot. Is it possible for you to post this file? If so you can edit your original post and add it there or use the "Use advanced editor" link in the upper right corner of the reply box.