Endpoint Encryption

I have been struggling for a while now with one of my computers being able to mount and access VHD images.  Everything works OK on computers without GuardianEdge, but computers with GuardianEdge fail. Here are the scenarios that I have tested:

1. Mount and existing image.  If I attempt to mount an existing VHD image the process is slow, but it does open and detect all of the expected partitions and even assigns them drive letters.  However, if I try to access\explore the drive it fails with an access denied message.
2. If I try to create a new VHD image (though the Disk Management snap-in) it is created OK, but if I try to format a new partition, the format fails.  In this scenario I do see an error in the event log from GuardianEdge Removable Storage Encryption.  The Event ID is 535 and the message is"A failure occured during the device mount process for device XXXXX. Applying a No Access policy to the device..."

If anyone has any ideas I am willing to try just about anything.

I have Seagate's BlackArmor Backup, a rebranded Acronis True-Image (2010 version, I think), and I get similar results when trying to "mount a backup as a drive letter" with Symantec Endpoint Encryption (SEE) installed and running.  I'm running XP Pro on work laptop, a Dell D630.

I'm mounting a backup stored on a NAS drive accessed via UNC location; creating the backup is no problem, and I have no trouble reading and writing to the NAS drive, either via UNC or mounted drive letter.  But the mounted backup (which I assume is a VHD image, or similar technology) takes forever to mount, is reported as mounted by BlackArmor Backup, but then I get "R: is not accessible, access is denied" when double-clicking on the drive letter.  (Additional note: no amount of F5 refreshing of any already-open Windows Explorer will show the drive letter among the available drives; you have to open a new Windows Explorer window for it to even be visible.)

Seagate's support site at

http://seagate.custkb.com/seagate/crm/selfservice/search.jsp?DocId=211371&NewLang=en

suggests turning off entryption/security, which of course my company won't permit.  Surely there should be a work-around that would allow this mount to succeed.

It worked without fail before installation of SEE a couple of months ago.  I've been doing these backups regularly for almost a year, and occasionally mounting the drives to review deleted files.