Apple has released Security Update 2012-001 v1.1 to address issues with Rosetta.

Security Update 2012-001 v1.1 is now available for Mac OS X v10.6.8 systems to address a compatibility issue. Version 1.1 of this update removes the ImageIO security fixes released in Security Update 2012-001.

Security Update 2012-001 v1.1 is available via Software Update and also as a standalone installer.

More info and download link here.

Related article:
Snow Leopard Security Update breaks Rosetta support; Apple aware of issue – February 3, 2012