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I apologise for not realising this is all connected when I reported the lack of sticky indicator on Preview in the Article forum view.

There is also no indicator in Preview list (that I have found) for:

• Threads you participated in (small avatar superimposed on larger author avatar)
• Threads you watch (bell icon)

It also seems  that titles remain bold even when they do not contain unread messages. For me this is probably the biggest issue as its the bold/unbold titiles are the first thing I look for, ie "is there anything new here?, or "what haven't I read?"