Hehe, I have also have the same three puzzles now unsolve themselves and the same effect with clearing the obstruction - my game is now showing as being 1800 hours old.

The other thing that I find since the first time this occurred is that the time is not advancing properly when I'm away from the game. I leave the game on fast and the villagers get only maybe two years older after 2 days away!

'tis definitely strange!