I was making a zoo on my game and one of my stupid friends imed me on yahoo. So the game minused down and I told them I would talk later, I brought back up the game and I noticed my undo button wouldn't work, I could click it but it wouldn't do anything. And I couldn't make waterfalls no matter how I tryed to.
I have a few downloads but even with them I was able to make waterfalls and use my undo button.
Have you tried restarting the game?
Once yes, and the same effect. It's been over an hour so I'll restart it soon, hopefully it'll work now.