Copied exported settings to update website design from https://22i.nl to http://theaterdeplaats.nl
Everyting is fine on 22i.nl (width 1000, no sidebars, image and menu1 in header area) and was fine on theaterdeplaats.nl (3 column, 2 sidebars, no menu in header area).
After importing settings from 22i to theaterdeplaats.nl theaterdeplaats.nl lost header images and menu settings.
Header image is in right location (../wp-content/ata-images/header/...jpg)
Removing css inserts did not help
Update: target site is now offline for restore