When entering widgets page/trying to edit widgets with gutenberg block editor/ I receive message:
Cannot Modify Header Information – Headers Already Sent By (output started at … inc\classes\Stylesstorage.php:161 etc
When the line is removed or just ‘$this->css’ or if I revert to classic widgets editor everything is OK
I am giving you a link to brand new dev fresh install.
There is also a problem with DEMO VERSIONS : “AJAX import error. Try to disable all external plugins and run the import again. If it doesn’t help, contact our support center for further assistance.”
Your current PHP “max_execution_time” parameter is less than 120 seconds. It might cause an import error and not upload all the attachments. The recommended value is 180 seconds and we suggest you contact your hosting provider to increase it.
I have changed my hosting server settings and now the import starts OK.
But I still think that the problem is not in my hosting php settings.
The import is not possible if Woo is not installed.
From the Woo installation depends the ‘Cannot Modify Header Information…’ ERROR in customizer page (customize.php) and widgets page (widgets.php).
I have created new install without any plugins so you can see the ERRORS=