Widescreen Fixer MW3 Not Working

[ITSANSS]

Just as the subject says - Just downloaded MW3 and tried to use the Widescreen Fixer to make the aspect ratio correct (playable) and it's not working. The fixer shows that the game is running and I can toggle the fixer on and off and it says it's working, but it's not doing anything to the display whatsover. I've used widescreen fixer for years and it works perfectly for Black Ops. What am I doing differently? Why isn't it working?!!?? Help!

Thanks