Subscribe fails when reloading dashboard

I have a dashboard with a simple Pub/Sub on UD100 and UD100A. Top grid shows UD100 and bottom grid shows UD100A. Each time I re-open the Dashboard, the subscribe arrow is gone and the functionality doesn’t work… even though the filter remains. I delete the filter and re-create the row and subscribe magically works again. Anyone ever seen this behavior?

Is the Pub/Sub out of box or a customization?

I’ll be honest, this is my first attempt at using the UD tables with child tables. I assumed I would setup the pub/sub just like any other dashboard. I use the Key1 value which exists in both the UD100/UD100A tables. So I publish Key1 up top and then the subscribe is Key1 in UD100A = the published Key1 from UD100. It’s weird because the values stay there in the filter tab, but the little arrow that shows it’s a subscriber disappears and it stops working. Only when I re-open the dashboard in developer mode. Once I create an assembly, the assembly seems to work indefinitely. But, I’m developing this right now so I’m in and out like 5 times an hour as I’m honing my solution. I’ve never seen this behavior.