Currently use QC to make custom layers for Bonix TV - a vision mixing kind of application for OS X with a kind of QC stack of layers, each layer being a composition with published ports and some protocols for data types. Also generate sports graphics and twitter feeds and so on for video score boards at large sporting venues.
Spent a few years learning Quartz Composer as my way back into coding from a decade away doing design related work. Film, graphics, studied Architecture for a few years and got involved in publishing then film. Now moving into front side web development. Hope to get into app dev with Vuo and rapid app prototyping.
Ok, unfortunately my two ext displays are in different locations to each other. I could try finding an extra monitor there to borrow and test you comp on weekend if Team Vuo have not responded by then.
One workaround would be to put a significant part of the composition into a compiled Vuo node (.vuonode) that the openable .vuo file uses. That way you could claim commercial IP on the .vuonode and this would discourage unapproved reuse by 3rd parties reselling your work. Requires being able to code a .vuonode in C though.
Does it help if you take the Requested Frame outputs and wire them to the Play Movie node or some other patch just to keep the events flowing?
For what it's worth, I changed the window positions so one is placed on my Retina display (0,0) and the other on my external display (2000,0) and both windows appeared 10 times in 10 restarts of the comp (with no other changes to comp).