I’m using Flat Responsive Pro and WordPress 4.61.
There is an issue with Font Awesome Shortcodes that cause the Live Composer plugin to stop working.
I have basically deactivated other plugins to test this ( Shopify, iQ Block Country, WP Inventory, WP Store Locator, Buttons X Lite, Jetpack and any other plugin that was not recommended ) The only plugin that seems to cause this problem is Font Awesome Shortcodes. Have you had any reported issues with this?
We are really sorry to inform you that it is the problem with the Font Awesome Shortcodes plugin and we already notice that, so you can contact to plugin author for it. Or you can remove the plugin and process to your work, if you got any problem then please let s know. We are happy to provide solution asap.