Ok, that's strange. A few more questions: Is there a green dot beside where MixEmergency says "Scratch Live" on the main MixEmergency window? (this should be green if you're running Scratch Live at the time) In MixEmergency's preferences (in the transition section), do you have "Use External Controller Crossfader" enabled? Do you have Video-SL installed? (you only need the demo version) Do you have Video-SL enabled on the setup screen of Scratch Live?