A new micro update to the 2009.Q2 software has been posted. This release fixes a double-parity RAID data integrity issue and is recommended for all double-parity RAID users still using 2009.Q2 software. This issue is already fixed in the 2009.Q3 software. All users with double-parity RAID configurations should scrub their pool(s) after upgrading to this software.

Complete release notes can be found here.