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Today when i logged into game Farmville 2(from facebook & zynga) the fullscreen button was missing. zooming out was also not working 100%. so it was difficult to work.
Report to support if you have cleared cache etc and tried all the suggestions on other threads here. Sorry I can't suggest any more. I use Chrome and have never had this problem.
Support contact : https://zyngasupport.helpshift.com/a/farmville-2/?contact=1