[da_judge]

Vbulletin5 is great... but if you running nginx i seen a few people having issues with it... well i got it running with rules below

Have fun

        location @php {
                    try_files $uri =404;
                    include /etc/nginx/fastcgi_params;
                    fastcgi_pass unix:/var/run/php5-fpm.sock;
                    fastcgi_index index.php;
                    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
                    fastcgi_intercept_errors on;
        }
rewrite ^/css.php$ /core/css.php last;
	rewrite ^/install/ /core/install/ last;
if ($uri !~ ".(gif|jpg|jpeg|png|css)$"){
	set $rule_2 1$rule_2;
}
if (!-f $request_filename){
	set $rule_2 2$rule_2;
}
if (!-d $request_filename){
	set $rule_2 3$rule_2;
}
if ($rule_2 = "321"){
	rewrite ^/(.*)$ /index.php?routestring=$1 last;
}
	rewrite ^/(admincp/)$ /index.php?routestring=$1 last;