nginx error

Hello,

I'm in the process of moving my D7 site to nginx but I have run into the following problem.

When I log in using an account with some administrative privileges I get a blank screen. When I login as a normal authenticated user everything works fine.

Does anybody have any idea what might be causing this?

This is my config:

nginx.conf

user nginx;
worker_processes 1;

error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;

events {
worker_connections 1024;
}

http {
include /etc/nginx/mime.types;