"Are you sure you want to do this?" when deactivating all plugins in Wordpress 4.3.1 [closed]

Question

• Wordpress version 4.3.1, running in network mode.
• Logged in as super admin.
• In the main site's dashboard.

When I try to deactivate all active plugins at once, I am taken to a white screen with the message

"Are you sure you want to do this?"

I have tried adding the following code to /wp-config.php mentioned in this quite old answer, but the issue remains.

function check_admin_referer($action = -1, $query_arg = '_wpnonce') {
    if ( -1 == $action )
        _doing_it_wrong( __FUNCTION__, __( 'You should specify a nonce action to be verified by using the first parameter.' ), '3.2' );

    $adminurl = strtolower(admin_url());
    $referer = strtolower(wp_get_referer());
    $result = isset($_REQUEST[$query_arg]) ? wp_verify_nonce($_REQUEST[$query_arg], $action) : false;
    if ( !$result && !(-1 == $action /* skip this: && strpos($referer, $adminurl) === 0 */) ) {
        wp_nonce_ays($action);
        die();
    }
    do_action('check_admin_referer', $action, $result);
    return $result;
}

It's a pain deactivating / reactivating plugins in small groups during troubleshooting.

Any thoughts? Thanks.

Answer 1

Problem found to be caused by the plugin Enhanced Ecommerce Google Analytics Plugin for WooCommerce version 1.0.16.

I gather the fact that this version of the plugin has not been tested with Wordpress 4.3.1 has something to do with the problem.