Here is the issue, since the website was turned https, the silders are not visible or accessible for backoffice. From the admin menu, the "All sliders" option only shows white pages. Also the purchase code needs to be reactivated, but the page where it has to be done doesn't show up either.
Any idea ? Your help would be very much appreciate.
That is strange, it shouldn't be causing problems like this. I believe it could be related to a conflict problem on your installation or a server configuration issue.Could you please try to temporary disable other plugins and switch to a default theme to see if that solves the issue. Please also check the LayerSlider System Status, located on the WP sidebar for any related error messages that could provide more information.