Autosave not working with Page builder

I have started to use Pootle page builder, free version and when i use it the autosave function stops working and revisions are not saved. I have tested with all other plugins disabled and the problem still occurs. When pagebuilder is disabled the autosave function starts working again!
I am using wordpress 4.7.2. I have the latest version of canvas and the pootlepress canvas child theme.
Web site is https://www.birthcare.org.uk