Not Solid, just a "Joined Surface

 From:  Michael Gibson
5786.4 In reply to 5786.3 
Hi Bill, in the STEP import library if it runs into some errors figuring out the joining information in there, it will just try to grab all the surfaces individually.

> I guess I will try joining everything together again surface by surface.

That's the main way to work on this kind of problem, at some point you'll probably find an area that may have some badly formed surfaces that may need to have some reconstruction.

- Michael