Look at http://wordpress.org/support/topic/troubleshooting-wordpress-35-master-list?replies=4 to see if your theme or plugin is listed as problematic and to learn how to check for javascript errors that will impact the WordPress admin area.
That said, you’re using a premium/paid theme. It’s best to go to the support site where you bought the theme for help with customizations and issues. These forums are for themes available in the WordPress theme directory at wordpress.org/extend/themes/.