I updated to WP 4.6.1 and updated the Royal theme to 2.7.3, along with installing the new version of VC 4.12 and Ultimate Add-Ons v 3.16.7 and my visual composer on the back-end stop working. Could you please take a look so that I can develop in the back-end. Thanks.
Site URL: hidden Theme version: 2.7.3
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That means you have to recreate Tabs element. If you use the latest VC version, but Tabs were created with old version, then you need re-add this element, because VC authors modified it in the recent update. So please remove current Tabs element from your page and re-add it from VC editor.