I had Inherited Fortress. Earlier in the game, I had play Apprentice and successfully trashed an Estate-as-Fortress, and it worked as expected (drew two cards, Estate returned to my hand). On this turn, the first move I made was to play Apprentice and trash an Estate. I was unable to do anything else afterwards. I tried reloading the interface, and it showed that the estate was back in my hand, but I hadn't drawn more cards, and I was unable to do anything else. My opponent granted an undo, and I tried to trash the Estate again, with the same effect. My opponent wouldn't grant any further undos, so I waited out the game timer.