Just a quicky

Has anyone come across this problem before? I'm in the process of modelling a house in Hexagon 2.1. Actually it started off in C5 Pro using Inagoni Architools, but I re-modelled completely in Hex using the origianl C5 model as nothing more than a template.

I wish to apply some realistic materials and render output via C5. Problem is 3DS and Amapi files import into C5 Pro - apparently OK. Hex files cause C5 to bring up an internal error and OBJ files seem to get some interesting cross facets on what appear to perfectly normal vertices.

Any ideas

Thanks inadvance

Dapper John