Theme Article Sections Broken with WordPress 4.3

The theme was working fine and I have now updated wordpress to 4.3 and the articles box doesnt allow you to add any text

The Abstract box has also dissapeared and References doesnt allow me to enter any content either

All other sections, Title, Subtitle, Funding, Acknowledgments etc are all fine

I have disabled all plugins and reverted back to an earlier version of WP and its working fine, but this isnt an ideal solution as my server will auto update to wp 4.3.

Is it possible to fix the theme for WordPress 4.3??