Problem with set fullscreen in webplayer

my monitor resolution is 1920 x 1080, If I set resolution to other values(less than monitor's resolution) and reload webpage, use function (Screen.isfullscreen = true) to set fullScreen will cause web player crash Error Message: 130608 10:08:30 Setting error display: 'The content was stopped because a fatal content error has been detected.', details: '', link: 0 web: shutdown player web: shutdown finished 130608 10:08:31 loader: final cleanup 130608 10:08:31 loader: unload unity dllI dont know why, for help Follow is error message: