Since the most recent update, it appears that clicking on a topic link doesn’t always take one to the first unread post, but to an earlier one (specifically, 20 posts earlier).
This is a known problem.
There hasn’t been a new version released yet, but I shall update as soon as it’s available.
Just to confuse matters, this has not yet happened to me. Perhaps that’s because I always go in to older threads via my icon at the top right?
Nope, latest posts is working for me as well. It’s clearly that worst possible thing, an intermittent fault.
Looks as though this is fixed in the new version just installed.