I know it always hasn't been like this, but you click on the off topic forum, and there is only one page...however, if you click a link from the email notification of a thread that is a couple days old, you can see the thread, even though the main page only shows one page worth of threads...
You should be able to adjust your settings in "User Options" to change this. Default is set to the last 24 hours.
or at the bottom of the page there is a pull down menu that lets you select how far back in time to display threads