Really great game, am loving it, even though the last two chambers I need to get gold are driving me beserk!
Anyhow, I found a bug:
I was on The Alchemy Lab map, and on completing it, as Questy walked into the next room I clicked on the tool tab (I think Map, specifically). This was just as the room panned, and then in the next room the entire tool tab was frozen out, forcing me to close and restart the game. Other than that I am a huge fan, and have added this to my ipad for when I go travelling and need some puzzlers!