The 1.2 patch seems to have broken SLI support.
What appears to be happening is that only one out of two GPUs are properly rendering structures and shadows - every other frame doesn't display structures or shadows on the map, giving the illusion of ghosting. Characters, terrain, etcetera render just fine. This problem is constant, and not intermittent.
In addition to breaking the playability of the game, this bug also gives people with SLI the ability to see all players on multiplayer maps, whether they're in buildings or hiding behind cover/concealment - the problem is likely exploitable and can probably be used to cheat.
I captured this problem in this video.