Hi,
Also had the blank page problem and was able to fix it by editing openmediavault-webgui (NGinx config located in /etc/nginx/sites-available).
Try to add the red line and tell us
location ~ \.php$ {
try_files $uri = 404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_pass unix:/var/run/php5-fpm-openmediavault-webgui.sock;
fastcgi_index index.php;
fastcgi_read_timeout 60s;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
}
No idea why I had to overwrite default value.