Did somemore testing and I strongly believe this is now a NX problem.
In PM change IPTC, opened in NX, deleted create date, saved, exited, open in PM and IPTC was there. The issue is with NX and when it asks for the "Please enter the date in the format mm/dd/yyyy" and if you don't change, it eliminates the IPTC info. Now my edit workflow has to change the created date before saving.
Kirk, thanks, but I've now sent this to Nikon Support.