I have just added a new user group to the site and set its permission level to Read Only. The three users in this group are not able to view any of the images throughout the site or sub-sites.

If I add a new user that isn't in a group with the same exact same permissions (Read Only) then that user is able to view all images throughout the site.

Would you know why one can see the images and the other can't? I have 3 days to finish this site so I really am in need of your help.