Could this be used to show private group activity to the group’s members?

I installed this plugin, and wondering if it will help with an issue I’m having. I want the main activity feed to show activity in private groups for members who are part of those groups. I thought this was happening, but it seems to have stopped on the live site. At first, I thought it was my caching plugins, as I saw the desired activity after I removed those plugins, but this evening, test posts from the main activity wall might blip in the My Groups sub view of the main activity wall, but not only disappear again, they don’t show on the all members tab.

I’m wondering if your plugin can be used to force visibility of private group activity to members of such groups when they view the all members tab of the main activity wall.