As the title says, if you're using the (Awesome) new Ctrl+U mode in the Tiles Pages, and you copy/move some tiles, the big black X's don't update their new positions.
Now, either they're not updating, or only some of the combos' references are being moved. In fact, I just tested this, and in the DoR tileset, the wind tiles (Between the ocean combos and cloud and ice combos.) are the ones being moved, but the rightmost combos of the groups weren't being moved.