Updated July 16th, 2012 10:30 AM PST: Additional details provided on confirmed examples where we have seen the blue screen issue.
Updated July 31st, 2012 1:36 PM PST: Issue was also experienced on Windows Server 2003 and has been confirmed by Symantec.
On July 11, 2012 at approximately 10:30 PM PT, Security Response started receiving reports of customers experiencing blue screens on Windows XP and Windows Server 2003 machines after applying definitions July 11th revision 18 and SONAR definitions July 11th rev11. This update only contained signature updates and no change to the SONAR driver.
The problem has been identified as a compatibility issue in SONAR definitions released July 11th at 6:25PM PT. Once the cause of the issue was discovered, the signature was...