CB Activity

Shouldn't matter as it sends the user object of the the profile owner to the activity stream API. I'm unable to duplicate your issue. Do you have caching enabled as maybe the page was cached?

I clear cache every time I exhale.

I do have quite a few plugins doing their dirty work. Opcache, Varnish, JCH Optimize (at least until I need Anti-Spam).

I will try to provide you steps to replicate.

Was able to replicate; sending you a PM with my creds.

There's query caching built into the stream API, but I can't see how it'd cause this unless the user object sent to the stream was wrong to begin with. To test this make the below change.

IN: libraries/CBLib/CB/Plugin/Activity/Activity.php
ON: Line 275 (note this maybe incorrect, as I'm on a dev build)
FROM: TO: ON: Line 304 (note this maybe incorrect, as I'm on a dev build)
FROM: TO:
In short this is commenting out the IF statement responsible for the cache of the query. I don't see how this could be causing your issue as it's static caching, which just caches the function results ran in the same process. In this case that's not happening as it's only being called once.

You can also enable debug mode and maximum error reporting in Joomla global configuration. Then view the users profile to see if any errors display. If none check the query log at the bottom of the page and find the query to the _activity table and see what user_id it's using in its query.

Will do and advise.

Bah, disregard the above. Your test user is connected to your admin user. When viewing your own profile you will see the activity of your self and the users you're connected to. When the admin views the test users profile they see nothing, because the test user has no activity. Everything is working fine and as intended.