404 after csv import

Guys,
for sure i did something stupid (wouldn be the first time:))…

If I import listings with CSV i get them nice on the map and the listing-overview-pages, but the detail-page itself gives an 404-error.

This happens not with frontend-entered listings: they work perfect.

I’m quite sure that the CSV-template is ok. We have used it before and it worked. Also the fact that the listing appear in the listing-overview-mode, and we can view all content in the CMS means that the content was imported correct, I guess.
The URL’s look logical, breadcrumbs look nice…
I tried to refresh the wordpress-permalink-page (flushing)… nothing changed…
Location-settings look good; translation of country: well done…

See attachment: the listingpage looks fine…

Any suggestion?

Thanks again!