I have a stuck notification for the gardening topic. I follow the topic, so it tells me when there are new threads, but as of Wednesday morning that notification remains 'live' even after I've looked at the topic. To start with clicking into any new threads got rid of the notification, but now nothing shifts it even if there aren't any new threads or new posts.
And clicking on a thread opens it in a new window, rather than the same window as used to happen.