WotLK blackscreen problem with 2 monitors

[Mammmor]

hello, i have 2 monitors and when i start game blackscreen appears. i tried change config.wtf file SET window=1 and SET maximazed=1 but fps drops.
when i disconnect one of the monitors and starting game fullscreen working without any problem. so i tried disable windowed mode ingame but blackscreen appears again.

first Monitor rez (1680x1050) second (1600x1200 which is not able to choose so i must add it in config file)

[Mammmor]

Anyone ??!!