Content search webpart (also recently changed items, etc) No results on saved page, while testresults in query builder look just fine.

Hi,

Recently my company made the swith to SharePoint 2013 (office 365) Entrepriser licence.

Now I'm trying to build a Collaboration site on a top level that shows me all the recently changed items.

Now when I use a content Search or Recently changed Items webpart, it always gives me the correct result in the query builder but when I save the page I get no results back from my webpart. (not ever)

We are still running IE8 but I also tried Chrome and the result is the same (empty webpart!) (On wikipage, webpart page, with or without publishing activated)

I've been trying and looking for days but can't seem to figger out what I am missing or forgetting. Are there maybe features that need to be actived or search settings that need be  modified?

Thanks in advance

Wkr,

Linda