Hey all, been a while....
Can X4 natively export to PDF?
Yes, and it works fine. You can find it in the File menu / publish to PDF. Choose "PDF for prepress" or "PDF/X3" for best results
Ariel, my "Publish to PDF" is grayed out.
I don't have enough data to give you an answer. For example, does that happen in all files or only one in particular?
Most of them, but not all.