Outside aircraft lights problem

Hello,All of my FS9 aircrafts' navigation and landing lights have suddenly gone berzerk. Instead of the usual flashing, they have large pixels, or boxes, around them. Also, the same effect happens when smoke is generated (like as touchdown).Otherwise, performance of the game/aircraft good....in fact it appears to have stepped up about 10 fps.Any suggestions of what this light phenomenon might be?Thanks,4deucer