Grid Bug

Just updated the site with latest updates for VC, WP4.5 and Kleo.
It now essentially seems the Grid has developed some bug. Main issue is that the grid section does not appear – until the page is refreshed a number of times then it suddenly appears, then next refresh it is gone.
Adding categories, in Post grid element – seems to work initially, but cannot edit as amended categoies won’t select.
I also added a simple separator element, but it does not appear either – tested on Chrome & IE.
The weird thing is – I can see all elements on the VC front end editor???

I reported this issue to WP Bakery and got this reply:
From: WPBakery Support [mailto:support@wpbakery.com]
Sent: Saturday, 16 April 2016 12:32 AM
To: Rob Keogh <rkeogh@imobilemedia.com.au>
Subject: Re: [#26944] Grid and Separator elements not working

 Hi Rkeogh,

 The issue is because there is an inbuilt version of Visual Composer (or the related code) present in your theme which is overriding the standalone plugin version and hence causing the issue. You will have to get rid of it. I would advise you to do so with the help of theme author, otherwise you might loose the extra elements added by him. Once this is done, you can install the standalone plugin and it will work fine. Kindly check.

Thank you,

 Ticket: http://wpbakery.freshdesk.com/helpdesk/tickets/26944