Strange duplicating behavior after dump & restore

[sneuvonen]

We're in the process of moving from an old CKAN version to a newer one. We have the new version installed and running. Today I took a database dump from the old one and restored it into the new. Everything works, except that I see double: each dataset/package is shown twice on the list (url .../dataset). Same thing, if I limit the search with organization, i.e. .../dataset?organization=geoinformatics. However, if I open the url .../organization/geoinformatics, I get the correct number of datasets (=no duplicates). I checked the database: no duplicates in table "package".

Anybody have any ideas what on earth (or beyond) might be causing this?

Thanks,
Sam