First – check that the menu imported is checked as primary menu (the check is at the end of the menu) help link http://help.wpestatetheme.org/assets/images/menu.jpg
If you deleted that menu, add a menu (type a name and press CREATE MENU button). Then assign it as primary menu from the checkbox.
If the checkbox is not saved, then it means you installed the theme wrong (theme inside theme, or something like this)
If you send me FTP credentials and wp-admin credentials I can confirm the cause and the solution.
My email is [email protected]