We recently released TeamSpeak 3 Server 3.0.11.1. The server is available for download here. Upgrading to server version 3.0.11.x requires some attention.

The are some major changes in the MySQL database plugin, as well as some changes regarding query clients and permissions.
We highly recommend making a backup of your existing database before testing and implementing this server, especially if you’re using a MySQL database.

Most notable changes in this server release are:
-> The MySQL plugin was removed in favor of Maria DB. At least MySQL 5.5.3 or MariaDB 5.5 are now required to run the server if you don’t want to use the default SQLite database. You must convert your current MySQL database for Maria DB and utf8mb4 support. Please read the documentation for further details and instructions.
-> Guest ServerQuery clients’ permissions can now be restricted with the negate flag. Many users had problems with query clients spamming chat messages and channels and this change allows to restrict this without affecting regular users. New server instances will restrict this by default, however for existing instances you’ll have to modify the permissions accordingly if you wish to have this effect.
-> Query client logins are now bound to the server on which they were created and only receive that users’ permissions on the virtual server they were created and will be treated as guest on other virtual servers.

So please take a close look at the changelog if you upgrade from a version prior to 3.0.11.