Alright, This thread is 4 years old, but picking it up and hope to se a response 
. I have been using the arranger and video just as you describe. Unfortunately now, the video stops when going to the next arranger event. Switching arranger track with my hotkey is not helping. I have to stop the song after it ends, then go to the next one, to get the video working. I would like to do like you, be able to continue seamlessly between songs. Help appreciated. Using 7.5. And a Macbook Pro.