Hi! I have this error too but only if:
1) User uses the website through a VPN (Citrix) and if the user is not an admin
So if the user runs it outside citrix it works
If the user runs it in citrix with Editor rights it does not work. With admin rights it works
I found the file /libraries/cck/base/form/store_inc.php where this error message is enqued and it seems it looks for a hash, but my finding does not really bring me forward:
if ( $toBeChecked && !in_array( $field->name, $config['options']['data_integrity_excluded'] ) ) {
$hash = JApplication::getHash( $value );
$hashed = $session->get( 'cck_hash_live_'.$field->name );
$session->clear( 'cck_hash_live_'.$field->name );
if ( $hash != $hashed ) {
$config['validate'] = 'error';
$integrity[] = $field->name;
}
}