If you subscribe and pay the monthly fee, those subscribers get service first when there are game problems. The rest of the people are stuck not being able to get the challenges complete. The game constantly freezes up and the rewards you work for are lost in computer abyss land. If you don't pay for VIP game play then you don't get any of the fast service or game fixes. Zynga is more worried about adding new features than making sure the game is reliable and easy to use.