As of 3.5 a change was made in the export to always strip out terms that are not checked "Include on Export". Previous to the 3.5 release this option only affected non-hierarchical keywords and when you requested to export Lightroom hierarchies they were always exported intact.Making this change makes sense since it makes the behavior with regular and hierarchical keywords consistent. However, if you do as I do and turn off "Include on Export" to create private keywords and to add organizational levels this change causes problems any time you attempt to use export to batch process images that you want to import back into your catalog. It creates a bunch of brand new duplicate keywords. It is just as bad as not having any keyword hierarchy at all. My specific problem is that this change has completely broken keyword processing when I use HDR Efex Pro. I think that in "Metdata" section of the export dialog that addition to "Write Keywords as Lightroom Hierarchy" there needs to be an new option in the export dialog something like "Always keep complete hierarchy".