When I do a search and use two words, so this will result in an OR search, everything seems to be working fine. But when I do an AND search with search results displayed on multiple pages, on every other page than page one, when I click on a thumb to get the larger image, I get this error:

Fatal error: Call to a member function getTitle() on a non-object in /srv/jackdaw/www/www.jacktummers.nl/collectie/zp-core/template-functions.php on line 912

You can try it out with this link: werft AND hondenshow

As always please try a standard theme. If the error does not appear something is wrong in your theme and you will need to find what.

Also 1.4.2.1 is not the latest release.

You are right. I was too fast posting this topic. It wasn't my theme by the way, but the ZP version. I checked with the default theme and that also gave me the error message. I thought that that would probably have nothing to do with the version, being only a small 'step' from 4.1.2.1 to 4.1.2.3. .

So you solved it by upgrading?

[i]a small 'step' from 4.1.2.1 to 4.1.2.3. .[/i]
That would be quite a step into the future indeed...:-)