Here is a problem I never experienced before:
I tried to import an IGES file into a new scene in Keyshot 3 and I get the message that there is no 3D geometry in the file. Nothing I could do.
However, when I tried to import the exact same file into Keyshot from my wife's login (same computer) it works perfectly... Same happens to WIRE files.
In version 4, from my login, Keyshot opens the file, but without any geometry. From my wife's login, no problem again.