In version 2.5 release, on my laptop, when I play in full-screen mode, after a while, the screen will flicker a few times, and then settle in with the background having turned pink, and usually mess with some of the other colors on-screen. Not all of them, but enough to be disconcerting. This can be (temporarily) fixed by alt+tabbing away then back, but it returns after a bit of play.
