Threatpost reports that Mac OS X 10.6.5 have issues with disk encryption software from PGP
Some Apple Mac users who rushed to upgrade their systems with the company's latest security patch were left to scramble for help after a conflict with disk encryption software from PGP rendered the upgraded Macs un-bootable. Reports of users who were unable to boot their Macs after upgrading their Mac OS X systems to the 10.6.5 version began appearing in PGP support forums on Wednesday.PGP Disk Encryption Bricks Upgraded Macs