Gerald, as long as you're logs (showing no update errors) are for an instance showing the admin hangup, then that's not the issue (and reapplying the update would not seem to help).
As for seeing what's hanging, I realize the PMT can be overwhelming Not also that you should be sure to update that:
Running the CF 2018 PMT? Have you manually applied the recent update to it? - ColdFusion
You simply need SOME tool to tell you whether any cf page is hanging up when you hit that admin page, and then what it's waiting for. Again, I can help you do that, perhaps in a matter of minutes in a shared desktop session. Too many variables to help more here (once we find what it is, then we would identify how to fix things).
If that interests you, please reach out via charlie at carehart dot org. It's too easy to miss that you may have replied here.
This issue has now went away after update 9. I have no idea what caused it or if some other update may have been applied to our RedHat Linux/WebSphere enviornment that fixed it. Complete mystery to me.