Blog being just a white,completely blank page.

Hello,

I’m having a problem with the blog page of my site.
It’s blank. And i’m desperate..A few days ago everything worked fine. It is possible that someone changed some stuff on the site since we are more people that have admin pass. But it will take a great deal of time to talk out with the person who supposedly modified something.

Website is: http://www.internationalaffairs.ro
And this is the blank blog page: http://www.internationalaffairs.ro/blog/

Any ideas?:S