witoldR

Problem:
The client is experiencing an issue with the WPML plugin where a category named 'Nieuws' is being displayed as 'not part of any category' when the plugin is activated. This issue is causing an extra category to be added in the backend. When the plugin is deactivated, the 'Nieuws' category is removed from the menu structure but reappears when the plugin is reactivated.

Solution:
We asked the client to confirm if the issue does not occur when WPML is deactivated and to provide the location on the website where the 'Nieuws' section is shown as 'not part of any category'. We also requested debug information from the client's site using this link: http://wpml.org/faq/provide-debug-information-faster-support/

Upon receiving further details, we identified that the default WordPress category term 'Uncategorized' (term ID 1) was appearing in Dutch as 'Geen onderdeel van een categorie' under the English version of the site and was translated into 'Nieuws' in Dutch. We advised the client to activate WPML and rename the default 'Uncategorized' (Geen onderdeel van een categorie) to 'News' in the appropriate language.

Please note that this solution might be irrelevant if it's outdated or not applicable to your case. If you're experiencing a similar issue and the provided solution does not help, we highly recommend checking the related known issues, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the issue persists, please open a new support ticket with us.