It used to be when on the site on my smartphone, each thread had at the top of the page a link back to whichever sub-forum you were in. (Actually, it was part of a group of links including one to the forums directory.) That link seems to have gone missing.
Using the back button on the browser isn't exactly a good solution. If, for example, you just responded to a post, the back button will take you to the thread without your response (If you used the quick response box), or the compose a reply page.
Any way to get those links back?
