We are testing the upgrade from 1.8.10 to 2.0.8. I don't know if this is related.
We have some soft linked services. You can see them with "display: none" in the source code, but clicking on the "+" of the parent services fails to show the soft linked child services (doesn't matter if in Monitoring or Configuration).
I did some debugging and could find out that the problem is the dot in the css id.
escaping the dot does the trick: