I have just updated my IFC export via the Autodesk Exchange | Apps site, but still have a problem.
I have set a view to display a particular design option. However the exported IFC does not show any element of the design option, only elements that are in the main model.
Having checked a bit further, if I change the Visibility Graphics to show the primary option then the elements in this option are exported.
But if the design option displayed is not the primary option, then the design option elements are missing.