No puedo editar mi web

Hello,
Thanks for opening this topic.

Here is a possible workflow for troubleshooting this issue :

1. Use the latest software versions : make sure WordPress, your theme and plugins are all updated to their latest versions.
2. In your WordPress admin, go to settings > general and verify that your WordPress Address (URL) and Site Address (URL) are identical. The website will not run properly if the urls are different.
3. Cache plugin : if you use a server cache or cache plugin, clear it’s cache content and disable caching via it’s settings.
4. Browser :

• clear your browser’s cache / history,
• try to switch to another browser,
• make sure you do not use any add-ons or extensions in your browser that may conflict with your website.

• Check for plugin conflict : Install the WP official Health check plugin. Activate the troubleshooting mode. Then deactivate all of your plugins. If it fixes the issue, re-activate your plugins one by one, until you identify the plugin in conflict.
• Child theme : activate the parent theme if you use a child theme
• Theme problem : try to activate a WordPress default theme ( Twenty … )
• Javascript : make sure you did not insert custom javascript code ( like analytics, subscription popup… ), for example in a widget, that could break your site.

To log possible code errors on your website, enable WP_DEBUG mode and log the output of the debug.log to a file that you can share on https://pastebin.com/ or https://gist.github.com ( to get a debug log file you need to set define( 'WP_DEBUG', true ); and define( 'WP_DEBUG_LOG', true ); in your wp_config.php file.

PROBLEMS IN THE LIVE CUSTOMIZER
If you have problems accessing the live customizer or editing content already created with Nimble Builder, note that you can use the Debug mode.

INCLUDING SCREENSHOTS
If relevant it also helps if you include screenshot(s) of the issue.
(Tip : You can use an online screenshot sharing tool like https://prnt.sc/ to include a link to screenshot.)

Hola de nuevo,
he hecho todo lo que menciona en su mensaje y el problema sigue igual.
Cuando trato de a?adir alguna sección nueva en la web, aparece este error:

{"success":true,"data":{"collection":[{"id":"__rep__me__","level":"column","collection":[{"id":"__rep__me__","level":"module","module_type":"czr_post_grid_module","ver_ini":"3.1.17","value":{"grid_main":{"post_number":"8","layout":"grid","columns":{"desktop":"4","tablet":"3","mobile":"1"},"show_excerpt":false,"content_padding":{"desktop":"10px"},"column_gap":{"desktop":"20px","tablet":"10px","mobile":"5px"},"row_gap":{"desktop":"5px"},"apply_shadow_on_hover":true},"grid_thumb":{"border_radius_css":{"_all_":"0px"}},"grid_metas":{"show_cats":true,"show_author":false},"grid_fonts":{"pt_font_family_css":"none","pt_font_size_css":{"desktop":"17px","tablet":"17px","mobile":"17px"},"pe_font_family_css":"none","pe_font_size_css":{"desktop":"15px"},"pe_color_css":"#6b6b6b"}}}],"ver_ini":"3.1.17","width":""}],"options":{"width":{"use-custom-inner-width":true,"inner-section-width":{"desktop":"1170px","mobile":"100%"}},"spacing":[]},"ver_ini":"3.1.17"}}

Aquí adjunto una captura: https://prnt.sc/1v03cz7

Por otro lado, la carpeta de Medios no me carga cuando quiero visualizarlo con las miniaturas. únicamente carga si lo pongo en modo de lista.

Adjunto capturas de lo que comento: https://prnt.sc/1v03scx https://prnt.sc/1v03x2j

Por otro lado, cuando intento modificar una foto que ya tengo publicada, me aparece como si no hubiera ninguna imagen seleccionada. (https://prnt.sc/1v046zr)

Otro problema que tengo es que no puedo instalar un tema predeterminado como me recomiendo el plugin health check. (https://prnt.sc/1v05tt5).

A ver si con esta información pueden ayudarme.

Gracias y un saludo,

Teresa.