[Interest] StackView weirdness

[jhihn at gmx.com]

I've been using stackview a while now.  I started a new project with  desktop osx 5.5.1. I laid out the UI,  made it a component,  then added a stack view with it set to the initial item set to that component.  The UI appeared for a second then disappeared.  The app was still running.  I fiddled with it a bit,  if I fixed the disappearing problem,  then it didn't layout the  UI correctly.  

Anyone have any idea what is going on?