Here's a stripped down version of my prototype with the issue. I've followed the suggestion, and it seems like there is something overriding the initial screen being drawn. Here's a screenshot of my groups and how it's set up.
Here's the capx
I don't think I have anything outside the norm, but obviously I'm missing something pretty fundamental here. The mining group, and cleanup group take a significant amount of time (pressing the need for this loading screen!). Whatever I do, I can't seem to get the layout to appear before the arrays are configured...
Also, just a heads up, the project uses the RandomPlus plugin!