Images won't show

Hello there, I am creating a website using Catch Evolution. Though I really like the Buddha that comes with it, I would like to have another image on the homepage. I have uploaded 20 images to the Media library, but I cannot see any of them. The library shows a listing of jpg-files with their specifics, but I cannot actually see any of the images. I cannot select any of the for the homepage either. I just shows up blank. Does anybody recognise this problem? I have been trying to figure out what went wrong all day now, but I just don't know what I'm looking for. Sincerely, Karen