Shame on me.
Got the admin area blocked by IP adres also.
Leave it for now. Because I've build the form from the ground up (maybe better this way).
There maybe comming some other site transfers from Joomla to WP in the near future. When the import/export doesn't go as it should I'll provide you with the exact details and temporary remove all the security measures.
Thanks for your assistance so far.
And my deepest appoligies for taking up your time.