Some servers do allow showing their pictures only on the pages, located at the same servers. It is done to defend from illegal use of pictures on other sites. When using WebWarper, such a server can mistake a decision, that its' images are "pasted" on webwarper.net site, for now the address of the page starts from http://webwarper.net/ww/... So, instead of its pictures, the server is placing some standard picture with an error message.
Regretfully, it is impossible to view such sites through WebWarper.