Nginx no static files after update

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http://serverfault.com – First, i must say that i am not expert in server administration, my site was setup by hosting admins (that i cannot contact anymore). Few days ago, i updated Nginx to latest version (admin told me that it is safe to do). But after that, my site serves only html content, no CSS, images, JS. If i try to open some image i get message "Wellcome to Nginx" (same thin if i try to open static.mysitedomain.com). More details: Site has static. subdomain, but static files are in same directory as they used to be before setting up static files. I was googling for some solutions, i tried to change some (HowTos)