adobe flash on firefox does not give me the option to reactivate in order to play games. What do I do about it. it tells my game is saved but still can't play all of the time

Can anyone solve this problem for me?  I play Farmville 2 all the time.  Recently, I was informed that now I have to reactivate it and that all I have to do is hit the click on the reactivate button.  I have never had this option pop up so I can do that.  I got a message that my  game had been saved and sometimes it works and sometimes it doesn't.  I don't know what else to do.  I have tried everything and nothing is working.  I cleared my history, cookies and cache.  I play on zyngagames.com sometimes, but it always sometimes tells me I have to reactivate my flash.  Can anyone help with this?