game crash or shows a blank page when entering the game

so every time i start a game, it goes fine during bp, but as soon as game start, it went totally blank and there is nothing i can do about it. i have tried restart my mac, restart the game and reload the game but it's all not working. my friend say they have same problem but none of them so serious like me. My mac is totally new and there should be nothing wrong with my mac.