A colleague and I were creating some tutorials for our end users when he went to a layer in Photo, right-clicked on it and chose Delete. We then noticed that there was no UNDO under the Edit menu for that operation. The History tooltab was also blank suddenly. He then went to recreate the layer and suddenly the history reappeared and he was able to undo and get the layer back. We tried to recreate the scenario but could not. I'm certain it was a glitch but just wanted to make it aware to all.