Mac OS X 10.6.5 may render Mac with PGP disk encryption unbootable

PGP Corporation advises:

Mac OS X PGP WDE customers should not apply the recent Mac OS X 10.6.5 update. Compatibility issues may prevent the system from successfully booting.

In the interim, customers can accomplish the upgrade safely if the PGP Whole Disk Encrypted system is first decrypted, then apply the MAC OS X 10.6.5 update and then re-encrypt. We will provide a detailed update how to upgrade a PGP Whole Disk Encrypted system to Mac OS X 10.6.5 as soon as a solution has been identified.

For customers who have already upgraded to 10.6.5 with PGP WDE encryption in place and thus stuck in an unbootable state, we recommend booting from the PGP Recovery CD.

More info here.

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