Something is up. I'd think it has something to do with the Rhino file if you tried the same file from both 2 and 3 with no luck. I opened up this from the rhino2 into Carrara4 Pro without changing any of the defaults. It's not that big of a file but does have a lot of trimmed surfaces. Have you tried some of the sample files from Rhino2/3 to see if anything will work? If nothing works you may need to reinstall Carrara. Maybe drop a note to Eovia support first and see what they think. If you can put up the file someplace I can take a look and see if it opens for me. wayne k guam usa