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My students (and Me) have experienced a problem when creating a simple toposurface. We can start and work our way through the entire process, but when we pick on the "Green Check", to finish the surface, the program just crashes... sometimes with an error message / Fatal Error... sometimes just shutting down and closing without warning. I haven't experienced this with any of the earlier versions of REVIT. We can do a small portion of the toposurface, finish it, save the file, re-open the surface and add a little more and repeat the process until complete... but it shouldn't be this way. HELP