***UPDATE***11/07/15
Howdy Farmers!
We received reports that some of you were unable to load the game and saw this message ‘Game Open in Another Window'. FarmVille 2 team is pleased to let you know your concern with loading the game has been now fixed. You should now be able to load your game without any error.
We are aware that some of you might have lost some progress as well. We'll keep you informed as and when we have an update. We would like to apologize and thank you for being patient while the team works to providing you with the best experience.
FarmVille 2 Player Support
*********************************************************
Howdy Farmers!
We are still getting the "Your game is opened in another window" message and also received reports on lost progress in their Farm.
We are aware of these concerns and assure you that the FarmVille 2 team is working hard to correct them. We appreciate and thank you for your patience while we work on resolving them. You don't need to write to support about this, but you CAN click the "Fix it, Zynga!" button at the bottom of this article to state that your account is affected.
We'll have everything back up and running in a moment!