oh I see...
I don't have examples now, but once subscribed on the "Edit my Subscriptions" it shows up & updates come through on the activity.
The problem is subscribing to them, yesterday I once again had to post something on a particular threat in order to get it on the subscriptions.
This again, was under linux using chrome.
I believe the connection between "Edit my Subscriptions" -> Activity is sound the problem remains in the initial subscription. ie.: the button.
I hope I'm making sense?
J