WPML Language Switcher Issue

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### **1. Verify WPML Language Settings**
– Go to **WPML > Languages** in your WordPress admin panel.
– Ensure that all desired languages are added and activated.
– Confirm that a default language has been set.

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### **2. Check Menu Language Switcher Configuration**
– Go to **Appearance > Menus**.
– Ensure that the **Language Switcher** is added to your menu.
– In the language switcher settings:
– Confirm that **All Languages** is selected.
– Check any display options that might restrict showing specific languages.

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### **3. Review Translation Completeness**
– WPML might hide languages without content by default.
– Navigate to **WPML > Translation Management** and confirm that you have translated posts, pages, or taxonomies for other languages.
– To show all languages regardless of content:
– Go to **WPML > Settings**.
– Under **Post Types Translation**, ensure that your desired post types are set to **Translatable**.

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### **4. WPML Settings for Language Switcher Visibility**
– Ensure that the option **Skip language switcher when a translation is missing** is **unchecked**.
– Go to **WPML > Languages > Language switcher options** and review the setting.

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### **5. Verify Permalink and URL Configuration**
– Check that WPML is generating proper language URLs:
– Go to **Settings > Permalinks** and save changes without making edits to refresh permalinks.
– Confirm that WPML is set to display languages as:
– Different directories (`/en/`, `/de/`).
– Parameters (`?lang=en`).
– Navigate to **WPML > Languages > Language URL format** to review this setting.

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### **6. Test Theme and Plugins Compatibility**
– Switch temporarily to a default theme (e.g., Twenty Twenty-Four) to check if the problem persists.
– Deactivate other plugins to see if there’s a conflict with WPML.

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### **7. Debug Custom Language Switcher Code (if applicable)**
If you are using a custom WPML language switcher:
– Check your code to ensure that it retrieves all active languages. Use the following WPML function:

$languages = apply_filters('wpml_active_languages', null);
  if (!empty($languages)) {
      foreach ($languages as $lang_code => $language) {
          echo $language['native_name'];
      }
  }

– Ensure that the custom code is not filtering out certain languages.

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### **8. Clear Caches**
– Clear any caching plugins (e.g., WP Super Cache, W3Speedster) you are using in your WordPress setup.
– If using a CDN, purge the cache there as well.

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### **9. Reinstall WPML**
If none of the above resolves the issue:
– Backup your website and database.
– Deactivate and delete the WPML plugin.
– Reinstall the latest version of WPML and activate it again.

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If the issue persists, please provide more context (e.g., theme, recent changes, or custom code related to WPML). This will help narrow down the problem further.