florianF-18

Problem:
You are unable to add more than three custom languages in WPML, and after attempting to add more, the page shows empty except for the WordPress side menu.
Solution:
1. Update the WPML plugins by navigating to Plugins -> Add new -> Commercial tab.
2. If the problem persists after updating, activate the WordPress debug mode. You can find a guide on how to do this here: https://developer.wordpress.org/advanced-administration/debug/debug-wordpress/
3. After activating debug mode, try to reproduce the issue and check for any fatal errors in the debug.log file located within the wp-content folder.

If these steps do not resolve your issue, or if the solution seems outdated or irrelevant to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. Additionally, please feel free to open a new support ticket for further assistance at WPML support forum.