Insert_Features_Imported_IGES seems to have changed completely in 2018. I use this method for importing cross sections from a scanner, but can't get it to work properly now.
When you open your IGES file, FIRST click on Options. The UNCHECK "Enable 3D Interconnect"
This is the new feature of SW2018 that allowed IGES (and other) files to be imported as a LINK.(and not converted to SW).
Thanks Bill, that's it. All good now.
Did you try import it and then after break the links?
Retrieving data ...