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With the latest update of the Google Chrome,  a new issue arose with menu display. 
In order to resolve it, check this article https://select.ticksy.com/article/11738

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How to enable Visual Composer front page editor?

Front End VC editor is disabled by default because some theme elements use advanced java script functionality, and these elements will not be displayed correctly until you save and refresh the page after adding them.

In order to enable front end VC editor, edit theme folder / framework / modules / visualcomposer / visual-composer-config.php file, and delete or comment out following lines:

if(function_exists('vc_disable_frontend')){
    vc_disable_frontend();
}