@ray said:

zzy is starting as a background process

 Generally, you just need to kill the task in Task Manager, and restart.
This can happen occasionally if you have other software that conflicts in some way. Very difficult to know what software that might be, perhaps something else creating openGL contexts. 

@gpeddino said:

And I want to create an actor that will read the incoming MTC and immediately jump to the correct scene.

 The question for me, is how do you find editing these timecodes to be easiest. I would build your approach around what you find easiest to edit/adjust.

@dusx said:

With that said, you use the standard method of mutating your inputs/outputs to the expected types. 

 @Aolis 

These User Actors of mine can be quite useful for that: https://troikatronix.com/add-ons/mutator-user-actors/

@CitizenJoe 

Did that first thing, no luck. Tried re-installing, no luck. Unplugged all the projectors (but kept all 3 monitors connected) and it started. Now I'll try it with all 8 projectors. 

Thanks for your help

Ray

If you are looking to output only the two blended images you don't need the first two stages you created. The blended stage will output to two projectors.

When you're looking at your blended stage in stage setup, you have two tabs beside the word 'stage'. In your case right now they say 4 and 5. By clicking these you can see which physical projector the stage is connected to. 

Once you remove the other two singular stages and ensure that the blended stages are being sent to the same physical projectors that those were previously connected to you should see the output you expect.