Support is here,
http://themeforest.net/item/metrolium-responsive-multipurpose-wp-theme/5018371/support and that is probably where you tried.
You should turn all the plugins off then restore on-by-one. Is that the way you did it?We turned off all of our plugins one-by-one, but the issue till occurred.
If using Chrome you can turn of the developer tools while you try to post. That might show a javascript error.
You can also change the wp-config.php from define('WP_DEBUG', false); to define('WP_DEBUG', true); and see if any errors are reported.