Usually, you also need to flush sessions to get permissions changes to take effect, though manually clearing the cache files should work too.
It may be an issue with your browser cache and/or cookies, or possibly with Firefox, since others have reported trouble with the latest FF version.
Whoops. I thought I managed to delete this before anyone replied.. Issue was that only the resource groups tab was visible and I had put the editor to admin group and edited policies for that. Should get some sleep I guess.. Thank you anyway.