I have rarely been able to view or download a full-size 'Resource Gallery' image with IE since Bazzah started it.
I've read numerous Apache Server FAQs and they all list the exact error members are getting here-
'Forbidden, you don't have permission......and a 404 error...etc.'
They all list the probable cause as
'Site server permissions are not correctly configured to allow certain 'User Groups' to access the directory or files...etc.'
Bazzah had the host check into it, but it seems they can't find anything wrong.
Nearly forgot why I posted this-
I am able to download if I use Firefox instead of IE,
Ubl6612 found a trick for IE that works occasionally for me.
As you click from thumbnail view to the individual image preview, click where the preview will be the instant that the page begins to draw up. Sometimes this does trigger the full-size image. You can't wait even a second or it's too late.