There was a short period of time today in which F-Secure Anti-Virus detected "Trojan-Downloader.Win32.Zlob.obfuscated" in several different files. This was a false alarm.
The problematic update was 2006-06-07_01, and the issue was resolved with the next update number 2006-06-07_02. We are sorry for any inconvenience that this false alarm might have caused to our customers.