Symantec Eraser Engine update

Perhaps the following explains the trouble I had with SEP11 and Vista.
From a email sent to platinum customers:

Update: Eraser Engine update - 01/18/07

Symantec has released an Eraser Engine update today, January 18th US Pacific Time. This update replaces a planned AV Engine update that was announced in a previous Platinum Bulletin. It addresses an issue seen by some customers using Symantec Endpoint Protection 11 on Windows Vista which in rare circumstances could cause the system to become unstable. Following this update, the AV Engine and Eraser will have the following versions:

naveng32.dll: 71.4.0.23
ccEraser.dll: 107.4.1.2