First off, Neko is a little bit off with FlxCamera, try compiling as flash,
If the problem continues, try lowering the res "1920 x 1080" to "1280 x 720".
Other than that, I have no other advice, this may be a glitch or something,
or maybe they didn't count on people selecting huge resolutions or something,
if all else fails, I suggest trying to mess with the Flx.camera.flash(); function.