[Floris]

Check the path to the images, and see what it says 'hover over an image and right click > properties' - you will see what it is and what it actually should be, change the path. You could also just edit the home page template: home_header and set the path manually, this is what I did to get them to work without spending too much time on it. Once the header buttons are correct, the rest will fall in place too probably.