Coming back from a trip to the US I presented my DNI (Permanent residence for a long time) to the immigration official. Normally I get through very fast however this time she took a long time, checked and rechecked. She wasn't rude but she seemed to WANT to find something wrong, finally asked me if I were a permanent resident. That should be obvious from the DNI. Also that information must be in her system. Is there something going on at immigration these days?