Dynamic Simulation Joint Preview meaning- and how to get it

[sschneiderXHH8R]

Hi.  I have an assembly comprised of smooth vertical tracks, ground, a lifting frame and a roughly rectangular component to be lifted by the lifting frame.

The dynamic simulation joints are working about half the time.  In the joints that work correctly, I get a "preview origin" when I hover over the joint in the browser.  I have attached a snip of what I'm seeing.

I've tried reordering the components within the Joint command (switching component 1 and 2), contact sets on/off and choosing different faces on the components that may engage with the other.

Thanks in advance.

[sschneiderXHH8R]

You've been extremely helpful.  Thanks for your interest and your time in this.  The description of  the required orientation of the loops eliminated a substantial roadblock for me.  I'd been thinking of the loops as surfaces that interact with one another, not fence perimeters with infinite height and depth.

Thanks again and have a great day!