Dear Loris
So it happened when you updated the Theme?
As some first steps:
Could you please post a link your website if possible
Wordpress, Lay Theme & Laytheme's Addons are all up to date?
Any Custom CSS or JS that may interfere is temporarily removed.
And third-party plugins de-activated to see if this resolves the issue.
License key not activated - (in website blank or button not available options)
And have looked into: https://laytheme.com/troubleshooting.html#nothing-shows-up
Let me know Loris and have a great day, sorry about any inconvenience
Sincerely
Richard