NightSky flashing

First off, this isn't the place to ask this. Second, is this the normal or Hd version? Third, what have you done to narrow down what the problem might be or when it occurs? "screen is flashing and I can't see anything" is hardly enough information for someone to go on.

Turn VSync on or off in your GPU settings. fixed it for me. If that doesn't work change antialias settings too.

Do you have a screen recording program running in the background? 'Cuz that happened to me once. (Not with NightSky, but with another game.)