I'm having trouble exporting the head morph as well. It could be something I'm doing wrong, as I haven't done this in a while.
I've tried both Poser 6 and 8.
Exporting with default settings applies the morph, but moves the heads position away from the rest of the body.
Exporting with export as morph target checked, the morph does nothing to the head when applied.

Could someone please post a screenshot with correct settings or a suggestion of what I could be doing wrong.
Thanks, Darren.

Daz Studio 4.8 and 4.9beta, Blender 2.78, Sketchup, Poser Pro 2014 Game Dev SR5 on Windows 8 Pro x64. Poser Display Units are inches