This happened to me a lot on earlier versions, and yes, it has been reported in the support forum, although I don't have the link handy. Anyway, what was suggested in the earlier report of this problem was to try playing in windowed mode rather than split screen. That fixed it for me.
To change to windowed mode, go to options, click on the video tab, and uncheck "Use Fullscreen". You don't need to reduce the resolution, it'll play fine at your full desktop resolution.