Link to a page where the issue can be seen: hidden link
I expected to see: full page
Instead, I got: page with only header and footer, all content is blank
I am leaving the plugin desactivated, otherwise it impacts my site entirely...
This happens only with WPML. I just updated my site with the latest WordPress version.
I see a lot of problems based on your debug information. I advise to fix the following:
IMPORTANT: Take full backup of your website and database beforehand. It is highly advised to try the following on a staging/dev site first, so your live website isn't compromised.
2) Fix “WP Memory Limit” to at least 128MB while 256MB is recommended. See https://wpml.org/home/minimum-requirements/ for detailed information. You can set this in your wp-config.php file by adding following code:
Remember to add these lines before the line where it says:
/* That's all, stop editing! Happy publishing. */
3) Update WPML plugins to the latest versions.
4) Update other plugins to the latest versions.
5) Update theme to the latest versions.
Please note that during steps #3 to #5, you may run into some errors, so it is advised to deactivate all plugins first, then update and then start activating (starting from WPML first).
Once a plugin is active, keep an eye on any WordPress notice by the plugin, asking for a database update or etc and follow along before activating the next one.
Please let me know if this helps or I'll try my best to help you further on the matter.