I haven't updated my art website for a while, i have some new paintings that i wanted to put on the website but every time i try to upload them from my hard drive they don't appear, i just get the name of the j-peg and a blank screen icon where the thumbnail should be. 

Hi, when i try to upload the images the name of the j-peg appears in the objects area but the preview doesn't appear and nothing happens when i try to move it into the main website maker window.