I can't view thumbnails, why?

For some reason when I click on a thumbnail to view the image I get a permission error?

Do I have to be a licensed customer in order to view images on this site?

Also, ALT +S doesn't work with starting a new thread due to there being two Create Thread buttons on the screen.
ok, thank you.... I guess I'm used to not being able to see the customer forums if unlicensed, rather then just blocking images.

Thanks for the info