I have this problem too, but not only in PoF, but also in HoT. The only thing that helps is shutting down my computer and restart. Then everything works fine. So I think it has something to do with Windows or display driver and not with GW itself, because it only recently started. Still, it would be nice that someone of Arenanet could confirm this problem and suggest a possible solution... Config: i7 - 5960XGeforce GTX98032GB RAM