Hello @l_eckardt,
Are you using a Child theme? There could be a custom PHP code that is no longer compatible with the latest version of the theme. Please switch to the parent theme instead. If that is not the case, ask for assistance from your hosting provider to check out the error messages in your error log.
If nothing is helping, provide us FTP and WP access to your site so that we can check your settings. Please create a secure note with the following info:
– Link to your site
– WP login URL
– WP username
– WP password
– WP Administrator Role
- FTP hostname
- FTP username
- FTP password
- Confirmation that we can access and make changes to your site
To know how to create a secure note, please check this out: How The Forum Works
Best Regards.