@mitcorb said:
This looks like very common importation problems having to do with long distance from SU origin...
I am almost pretty sure that's the case here, too. Make sure that when importing CAD files, you do not preserve their drawing origin (this is step 1 of the trouble shooting process as there may be any stray geometry elsewhere as well as groups/components may have their origins in outer space somewhere but start here)
PreserveOrigin.jpg