like this game: https://www.kongregate.com/games/Vogd/diggy
game dont launch, window of game flickers. flash version newest. on other browsers it works fine.
I tried on mine and it worked just fine. Same version of Opera but on Windows 7 x64. Flash version apparently is 184.108.40.206.
You can try with a portable version of Opera to see if it is related to your installation or profile.