I can no longer mist and go through gates at night, like going into Gnomebarrow or Highport. Has something been changed in the code? Is this the way things are going to be from now on? Or is my vamp just getting too damn fat to fit through the gates????

Yes, this has been changed. A misted vampire was previously allowed to sneak through DayOnly exits. I didn't see the logic behind this, so I removed it.