GSgallery 2.0 - Simple Image Gallery Plugin (Square It)

[alexandro]

hi everyone,
got a problem with the simple image gallery plugin. backend works fine. but in frontend all thumbnails are only visible while logged into the backend. maybe a permisson or cookie problem?
anyone ideas?

edit:
found out that its a cookie problem.
in thumb.php there is a login_cookie_check(); commenting it out all works fine. but surely thats not a secure solution. what is that login_cookie_check(); in thumb.php for? how can i get thumb.php working for my plugin gsgallery without beeing logged into the admin panel?
anyone ideas? thx