"Do not proceed" on filevaulted system after 10.7.2

Hi all,

I have a Macbook Air (mid-2011) system I use for preproduction testing. Previously, I had installed 10.7.1 and filevaulted the system. Today, after installing the 10.7.2 update via Software Update, the machine booted to the Do not proceed symbol (grey circle slash). As this is a MacBook Air, there's not a really easy way to target disk mode to another machine (this is my only Thunderbolt system). I determined I was able to boot to Verbose/Single user mode by holding the key combination prior to the encryption screen, which provided the following diagnostic output:

Still waiting for root device

Precisely as expected, based on my previous experience with PGP'd macs.

On PGP, I was able to mount disk0s3 from the another machine's Terminal app, delete boot.efi from the Boot OS X partition, and replace it with a renamed pgpboot.efi. Digging around in a similar fashion with Filevault, I was able to find a similar recovery partition at disk0s3, but no similar boot.efi files for replacement.

Anyone have any thoughts on recover here? No data loss for me on this system, but I just wanted to get this out there for anyone having similar issues.

Thanks!

Mike