Posts are visible only with Yoast SEO disabled

Hi,

Can you confirm your server has all the right requirements? ?If you are not sure, speak to your host provider.?They may need to increase the PHP memory.?This guide explains more:?https://kb.yoast.com/kb/plugin-requirements/.

Are all your non-Yoast plugins and themes also updated?

My server is supposed to have the right requirements but I’ll check with their support again.
Yes my plugins are updated.
Thank you for your links. Very helpful.
I’ll let you know a feedback from my host support.
Thanks again.

I checked out the server requirements with my Host support. And they say it’s ok.
Anyway I asked them to change the memory limit as explained in the post you linked:

Add this line to your wp-config.php file:
define(‘WP_MEMORY_LIMIT’, ‘256M’);
Change this line in your server’s PHP.ini file:
memory_limit = 256M;
Add this to your .htaccess file:
php_value memory_limit 256M

They say the limite has been raised to 768.

Then I tried to activate Yoast again but several (random) posts where not visible again. In particular these:
https://www.quiddivinum.it/fotografia-spazio-arredato/
or
https://www.quiddivinum.it/visual-design-per-camere-d-albergo/
Now The site runs normally because Yoast is deactivated.

We’re sorry that you are experiencing problems that might be caused by our plugin!

Just to be sure, we would like to rule out any plugin or theme conflicts that may occur. The fastest way to do this is to?deactivate all non-Yoast plugins and switch to a standard theme?like?Twenty Nineteen.?

Test this on your development or staging site, if you have one. If not, we recommend using the?Health Check & Troubleshooting?plugin. This plugin allows you to run a conflict check?without affecting normal visitors to your site.

As we can imagine that you’re unfamiliar with checking for conflicts, we’d like to point you to a step-by-step guide that will walk you through the process:?How to check for plugin conflicts.

We’re sorry that you are experiencing problems that might be caused by our plugin! Just to be sure, we would like to rule out any plugin or theme conflicts that may occur. The fastest way to do this is to?deactivate all non-Yoast plugins and switch to a standard theme?like?Twenty Nineteen.?Test this on your development or staging site, if you have one. If not, we recommend using the?Health Check & Troubleshooting?plugin. This plugin allows you to run a conflict check?without affecting normal visitors to your site.As we can imagine that you’re unfamiliar with checking for conflicts, we’d like to point you to a step-by-step guide that will walk you through the process:?How to check for plugin conflicts.

Thank you for your tips but I’ve already tried the troubleshooting procedure, with no other result than this: Yoast is the only plugin that causes the issue.

My website work normally now, thanks to the intervention of the technical support of my host. F.y.i. I paste here their last reply:

Hello,

I have carefully investigated the cause for the issue. The white screen that appears when accessing some of the posts of your website was a result of memory exhaustion during the execution of one of plugin scripts.

After further testing, the problem was pinpointed to a redirect loop during the retrieval of some of the breadcrumb term parent items of Yoast Seo. In order to address the problem, I removed the nested cycle of the function and have set up the process to be executed one-time.

The old version of the script is still available in plugins/wordpress-seo/frontend/class-breadcrumbs.php_bk.

All tested pages appear to work properly now. Please check the results on your end.

Best regards,

Regards