The link I'm providing is a GROUP CATEGORY LAYOUT menu item, to help illustrate what I think is a general bug.
On the activity stream, if you're a guest you get a wonderful summary of all the stream happenings from all the groups in that category...
BUT.. If you login, the stream becomes restricted suddenly to only the groups you are a member of... clearly that wouldn't be the intention behind having a 'GROUP CATEGORY LAYOUT stream'... The logged-in user should see the same as the guest (maybe more if for example they are private groups he / she is a member of... but certainly they shouldn't be seeing less!!!!)
On this occasion I would appreciate a 'hot-fix' for my site ahead of the next update if that is possible due to the time urgency of my project. Thanks!