Unite Revolution Slider 2 - Slider issue: "[] operator not supported for strings"

Very easy fix: Go to administrator/components/com_uniterevolution2/inc_php/framework

and edit the file base_admin.class.php

At line 23 change this: private static $arrMetaBoxes = ''; 

to this:

private static $arrMetaBoxes = array();

https://unitecms.ticksy.com/ticket/1110208/