Julian_M,
Thanks for your reply; here's my system profile:
Hardware:
iMac 21.5-inch, Mid 2011
Processor: 2.5 GHz Intel Core i5
Memory: 12 GB 1333 MHz DDR3
Software:
Mac OS X Lion 10.7.4 (11E53)
PGP Desktop 10.2.1 MacOSX
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There are no error messages. I can send no useful screenshots, since none of my virtual disks will mount on the desktop, despite (apparently) successful decryption—the decrypted virtual disks do appear in Disk Utility, but cannot be mounted from there, either.
I've removed all PGP components from my system, after decrypting my critical volumes via the Disk Utility / disk image work-around—as I'm not confident about continued availability of my critical files, or the overall integrity of my system, with PGPwde installed.
Thank you for any assistance!