403 Errors with Lazy Gallery

The Lazy Gallery plugin is just what I need for my site…problem is, after I get it installed and set up…some of the thumbnails in some of the subfolders won’t load AND when I click on some of the thumbnails I get a 403 Error.

Eventually after getting the 403 error many times while trying to figure out the issue…the server starts denying me access to the site at all.

Any suggestions?