[xwiki-users] Panels only shown to administrators

Hi all, I've been asked by my company to set up a XWiki to share documentation between different groups. So far it's been going pretty well, but I seem to have a problem with the panel sidebars. When logged in as administrator everything shows up as it should: on the left a navigation panel and on the right the standard quick links and recent modifications panels. If I change however to a normal user the panels aren't shown, only the blank spaces where they should be. I expect it to be some issue with group or user rights I, perhaps, changed, but I have no idea where to find it. And I can't seem to find any documentation over which groups can see which panels? Thanks in advance, Arne Pannecoucque