I'm using an ETC insight. It boots up fine and all DMX functions work perfectly. As soon as I enter any command the video from the console goes all garbled and jittery. I'm using the monochrome out port into a video scaler. Video is fine before the command is executed.
Did it work fine at one point and then stop working fine? Can you please give more info on the video scaler you are using? Guessing you are converting from CGA to VGA? Also see: