Page builder broken after WordPress update 4.5.3

I have just updated WordPress to 4.5.3 and page builder has disappeared from all of my pages. I have seen others have had this issue but can’t see a solution.

The plugin is still active but on each page, the page builder button along the top has disappeared and now it only says “visual” and “text”. It now has page builder at the bottom of the page but with nothing in it.

All of my pages are were built with page builder and now they’re too complex to edit using just the “text” view.

Can you help me get this back to the way it was?

The theme I have is called access press parallax

Thank you,

Brian