Thread-start button disabled at limit. When a group has reached its maximum number of open threads, the "Start thread" button is now disabled rather than letting you write a post that can't be saved.
Dashboard loads fewer items initially. The dashboard now shows a smaller set of recent threads and polls by default for faster load times, especially on instances with many groups.
Email replies to notifications. Replying directly to a notification email (rather than a thread email) now bounces back with a clear message rather than being silently discarded.
Group data exports include comment titles. CSV and HTML exports of group data now include comment titles alongside body text.