I moved something onto Key 4 today and couldn't get it to work. As a test, I switched what was in Key 1 to Key 4, and it didn't work but what was in Key 4 worked in Key 1.
I even swapped out the custom control from Key 3 to Key 4. Everything worked, made the cuts, turned on/off keys, rolled the video off Blackstorm and switched sources but no graphic appeared on screen.
Is there a setting I need to change to get Key 4 to work like Keys 1,2,3?