I've run into this multiple times when inporting an iges file, the Environment/settings/size becomes reset to a very small size resulting in surfaces going black. This is the case in 9 and 9.1
Wayne
I get this too but not just with .iges but with all imports including Keyshot geometry.
Didn't tried it yet. But if you import a file into a scene with existing geometry (e.g. a dummy cube) you can uncheck import options like environment and modify environment size.
Hope that helps
Cheers
Marco
P.S. written on a mobile
Thanks for reporting this, guys (and potential gals)!
I can reproduce the issue.
The behaviour appears to be triggered by having "Adjust Environment to Fit Geometry" checked on first import. This seems to affect all subsequent imports.
Dries