I’m not 100% sure what my users are referring to, so I just thought I would use their words to try to explain the “issue” … It may be a feature…
One user said:
Also gone, I think, on the mobile app is the line separating the old threads that haven’t had a new post and the ones that have since my last visit. It also showed, in blue, how many threads had new posts since last visit.
Another said:
This was mentioned above for the mobile app, but also when using the Chrome browser on Windows 10, the line which separated threads in a forum seen on my last visit from those more recently updated is no longer present.