Message Attachment Viewing Permissions using Lightbox
 

I have searched & searched, on my site, vbulletin.org & here.
I use Lightbox for attachment viewing, I really like using this option, but Guest, not logged in can use this option.

Message Attachment Options

"View Attached Images Inline, I set it to yes"
"Use Image Lightbox, I set it to yes, click"

----------------------------------------------

Usergroup: Unregistered / Not Logged In-Forum Viewing Permissions

Can See Thumbnails, also set to yes.

What do I need to edit to allow guest, not logged in to use lightbox while viewing attachments?

Thanks in advance.