I have a somewhat strange problem that I cant figure out how to solve. I am extending ModelAdmin to manage some data objects in the CMS. In the attached example images you can see the behaviour. When I click the Search button (or Create for that matter) the page is 1) not opened in the right <div> (the right part of the main page), it takes over the window completely and 2) not styled at all, it seems the URL:s towards the CSS file and assets are all wrong.
The strange thing here is that it all worked fine some weeks ago and I cant for the world think of any update that could cause this behaviour.
The URL in the address field says "http://www.mydomain.com/admin/object-manager/Size/SearchForm?Title=&ResultAssembly[Title]=Title&action_search=Search" after I have clicked the Search button, if that is of any help. The logs give me nothing.
I am running SilverStripe 2.4.7.
Any ideas? I appreciate all hints and tips on this one. Tnx!