thanks for the feedback,
yes, i've tried the rebuild thumb option already but unfortunately still no joy.
like i said, the images appear to be there when you go Edit It however, only one appears once the ad is live.
chuck, i've sent you all the details you requested to the Contact Us address. our watermarks are also a little out of whack (sometimes appearing large across the image, other times really small). I think both issues may be linked to image size settings.
thanks again for the reply.