WPMU Thumbnails problem

Hi,

i am testing Wordpress MU and i am facing a problem with thumbs. Since i can't post urls i have attached a file with my problem. Hope i am not breaking the rules.

I would appreciate any help

I am assuming you have already setup the custom field for thumbs within wp-robot?

Also, if you are hosted with hostgator, you may have to ask their support staff to white list your domain for mod_security rules for timthumb (assuming your theme uses timthumb to generate thumbnails)