I just played around with servernotifyregister in Teamspeak 3 Server Query within the TS3 client. After testing a bit and trying all events, the complete server process got crashed (not only the virtual server).

The only message I found was in the server log:

12.02.2010 10:59:02 Query Critical getSocketID called with an invalid clientID
Using server beta 18 with MySQL database (Debian 5) and client beta 15 (Windows 7).