We have a Dataflex 2016 18.2 mobile webapp running in a Wordpress site. The Wordpress site uses the DF4WP plugin to access the server running the Dataflex webapp. This has been working for some time and still works in Firefox, Edge and IE but has just stopped working in Chrome. It gives the error, 'Session key not known (reload page to recreate session)'. This is a public facing booking form so we have no direct control over the user's settings in their browser.

I would appreciate any advice on how and where to start looking to resolve the problem. Thanks in advance. Paul