Master branch of the git repo has a couple of great changes in it that need testing.
An exploit that allowed people to log users out of chat by posting a malicious image has (finally, thanks to a pull request by Jugolo) been patched.
HTML5 audio support has been added, thanks to jamrial.
If you're using an integration version, you can replace the changed files (just replace everything except your lib/config.php, lib/custom.php and lib/class/CustomAJAXChat.php )