Oliver, I’m running that exact setup and blog post from the home blog and other blogs show up just fine in sitewide activity. Are you saying that blogs other than the wpmu root blog are not showing activity?
Do you have some kind of blog privacy plugin running?
There is no privacy-related plugin in either /plugins/ or /mu-plugins/ anymore.
What I have found out in the meantime is that after the movement of the buddypress plugin to the /plugin/ directory – I had to manually enable it on the top-level site. It also does appear as a regular plugin an ALL other sites (which feels flawed, as those sites should not list this plugin as “inherited option”).
The other sites get the standard MU-Admin bar. If I enable the BuddyPress plugin on that sites manually, I do get the BP-Admin-Bar again and it seems that their updates are being shown on the top-level site again. This feels like I need to got through all of the MU blogs an enable the BuddyPress Plugin manually.
From my conceptual understanding I think this can’t be the intended way – a BP installation should be globally – not per blog.
Update:
I was wondering about BP behaving like a ordinary plugin – so I re-read the forum post regarding the movement from /mu-plugins/ to the /plugins/ directory (see https://buddypress.org/forums/topic.php?id=1994)
I stumbled over the part “enable each plugin but CORE first” there. In my context the BP plugins shows up as a single ordinary plugin. I can’t “enable CORE first” I wonder if that is realted to the issue I see here…
Update:
I seem to have an issue related to the WPMU-Version.
On the page https://buddypress.org/forums/topic.php?id=1994 I overlooked the “Please also make sure you are not using the MU trunk, but the 2.7 branch.” note — I was using the WPMU trunk. So I “downgraded” to the 2.7 branch.
Now I have “Activate XYZ plugin sitewide”-Options in the Plugin area. I still have a single BP-Plugin though. I activated the BP Plugin sitewide. And it seems to worl fine.
But I ran into following problem:
I needed to update “/wp-includes/capabilities.php” to the one of the trunk-Version. The one of the 2.7-branch gave me this error on all pages:
Warning: array_merge() [function.array-merge]: Argument #2 is not an array in
/www/wpmu/wp-includes/capabilities.php on line 537
Warning: array_merge() [function.array-merge]: Argument #1 is not an array in
/www/wpmu/wp-includes/capabilities.php on line 537
Warning: array_merge() [function.array-merge]: Argument #1 is not an array in
/www/wpmu/wp-includes/capabilities.php on line 539
Discussion is not continuing on https://buddypress.org/forums/topic.php?id=1994