Drupal 7 - Page Manger - Panels - No gear button - Can't add Views

In the eventually you can't see the 'Gear button' on Panels / Panelizer .   Like this

This is a JQuery issue.

You should either add the module 'JQuery Update'  ; if you have already installed this module then you may well need to check the settings.  Try changing the default JQuery version or the 'Alternate jQuery version for administrative pages'  .  Save and Clear Cache.