3D Vision Is Broken With Multiple Monitors

More accurately, "My Asus VG278H won't enable the IR emitter and synch with the 3D Vision 2 glasses that came with it, unless it's the only monitor attached to my computer, or the 3D application in question is running in a windowed mode." Diablo 3 works fine in 3D (but I run in Fullscreen Windowed), but none of the other games I have (all via Steam) work. They appear to be rendering both views but my monitor refuses to activate the IR emitter and synch up with the shutter glasses. Disconnecting my second monitor, for some reason, makes the IR emitter work. Hurrah.