I recommend asking at https://wordpress.org/plugins/advanced-custom-fields/#new-post so the plugin’s developers and support community can help you with this.
Hello @ovalhead ,
The Error message “ACF was unable to perform validation due to an invalid security nonce being provided” is a typically occurs due to security nonce validation issue in WordPress.
Here are steps to troubleshoot and resolve this issue:
- Clear Browser Cache.
- Check Theme or Plugin Conflict.
- Increase PHP Memory Limit.
Copy code, and mention into the wp-config.php
define(‘WP_MEMORY_LIMIT’, ‘256M’);
- Update ACF and WordPress.
- Check for Nonce Expiry.
- Fix Nonce Verification Code,If you’ve customized any part of the ACF or WordPress backend, ensure the nonce verification code is correct. It should look like this:
wp_nonce_field( ‘acf_save_post’, ‘acf_nonce’ );
- Disable Object Caching.
- Check for Javascript Errors.
If these steps don’t resolve the issue, let me know and we can investigate further!
I was able to resolve this issue by removing the following code from functions.php, which was being used to try and show WP’s default custom fields interface even with ACF installed.
// show default custom fields, even with ACF add_filter( 'acf/settings/remove_wp_meta_box', '__return_false' );
