[Plugin: vBSSO] Logout redirection problem

Hi!

When im logged and klick on logout button in wordpress page i will be redirected to white page (url= http://ralli.ee/foorum/vbsso/vbsso.php?do=logout&d=http%3A%2F%2Fralli.ee%2F&lid=4f1c5………) and nothing happening.
Login redirection works.

What can be a problem?

http://wordpress.org/extend/plugins/vbsso/