Missing image at side top

I just changed the url on my site from prosjektservice.net/metodikk to prosjektservice.net/us using ftp and changing the general settings. That went fine, except from the picture at the top of the pages. It totally disappeared, leaving just a question mark. I have tried to upload the image again in the Side top page, but I always get the question mark and no errors. I have checked the uploads folder, and the image is there. I have also cleared the cache. So, what to do? I am using twenty eleven 1,3.