@BB Hi there, so you’ve updated to WordPress 4.0 and updated the theme? New versions of the themes were released last week which were compatible with WordPress 4.0, they were made available through your themeforest account.
The last thread the user had turned off the responsive display using css, so then I gave him the css snippet to hide the menu dropdown. Have you also turned off the responsive display using that css snippet previously? Or is your site still full responsive but the drop down is still appearing? Can you leave a live link to your site so we can take a look what’s happening.
If you urgently need to get the site back up you can roll back to the previous version of wordpress until you’ve managed to resolve the 4.0 menu issue.