Dear Raoul @rgo
This one will need further inspection because its hard to say without access to your website.
As some first steps of debugging just to be sure:
Wordpress, Lay Theme & Laytheme's Addons are all up to date ?
Any Custom CSS or JS that may interfere is temporarily removed.
Any third-party plugins de-activated to see if this resolves the issue.
License key not activated - (in website blank situations or button not available)
If your WordPress Dashboard shows a warning "PHP Update required” please update your PHP version in your webhost control panel.
Additionally please take a look at https://laytheme.com/troubleshooting.html for known problems.
If these do not help:
Could you please send your website address, /wp-admin/ username and password and a link to this topic to info@laytheme.com?
And will try to get this Bug sorted out as soon as possible
Sorry for any Inconvenience Raoul and talk soon :)
Best
Richard
