This past Wednesday the devs over at the osTicket forums updated their forum software.
The new forum software is pretty similar to the old but there are no more categories. The site uses tags to determine how posts are organized. You can add tags to your post when you create it.
There is a new version of the 1.10 series, specifically the stable 1.10.1 Security Update. You can get this version via github or at http://osticket.com/download. It features some improvements/bug fixes, and an important security update. Here is a list of the changes: