Hello there,
it looks like this bug is back again: Notifications icon in "Activity/Communications/Actions" bar not updating ( SCNSBS-1511)
I have read the currently only entry in my communications stream (several times now) and the green icon disappears correctly, but when I go to another SCN page, it's back again and so is the unread status of that entry.
It's a part of the "SCN Known Issues List" and there it is noted as "open", but I didn't have this problem like two hours ago.
Regards,
Steffi.