[Samba] RSAT Hang

[Gregory Sloop]

So, I setup Samba on Ubuntu 18.04, using the packaged Samba version. [Thanks Rowland/Louis et al.]

I'm doing some testing/tinkering using FreeNAS as a share, using the AD as the authentication back-end.
As part of that process, you need to add a computer account and change some security settings.

I setup RSAT and can see the AD tree, and add users etc.
When I try to switch to advanced view and view the security tab of a created user or computer account, it hangs and never returns the details I'm looking for.

-The machine RSAT is on is pointed at the Samba server for DNS, and it's resolving queries properly.

I can create user/computer accounts fine. It's just when I try to view the security tab, that things hang.
A quick search doesn't seem to find anything.

Nothing in the logs that seems relevant.
Suggestions? [Just point me in the right general direction...unless you have something better...]

TIA
-Greg