The download version for Windows. I assembled the dirty band and hat without showing it to dad for him to comment the stains (I think), and therefore mom just keeps saying that the band is in the laundry. It worked fine in the browser version. I will try to recreate it on the downloadable one.
Edit: Just checked. If you assemble hat and band before talking to mom or dad (after finding the band) it breaks the game. This might also be the case for the browser version, since this seems like a logical programming error.