maybe disable retriangulate polygons, and check if your scene units are correct.
Disabled, did not help
In 3d max 2009 is worked!
In 3d max 2009 it worked! Extension IGES by layers. In all new versions, the layers ceased to work
Why when importing new versions of 3d max merge layers??!!!
Why when importing new versions of 3d max merge layers??!!!(.iges)
When you import layers either merge or break, in 3dmax 2009 everything was fine!!!
Do you think this is somehow V-Ray related ?
I think that you do not work that, and new versions work worse.