Hi. I have a 15" rMBP running Mountain Lion 10.8.4 and a FileVault 2 encryption set up. I also have an external WD MyBook 2TB USB3 drive, which is split into two volumes, both encrypted. I'm having a minor issue when mounting the volumes on the external drive. For some reason after the volumes are already mounted, I get a popup requesting the encryption key of one of the partitions. This happens AFTER the volumes are mounted with their respective keys already read from the keychain where they are stored. What's even more strange, is that if I try to enter the key of the volume (which I absolutely know to be correct) it keeps rejecting it. But I can access the data on the volume fine, so I can just ignore the dialog and press cancel, and everything is fine again until next reboot. I already checked the keychain, and removed the stored keys, re-entered them when I mounted the volumes, and again stored them to the keychain. But it still keeps asking the extra key. I also checked the conversion status of both partitions, and they were reported as complete. Checking the volumes with Disk Utility also found no problems. Does anyone have any idea, why this could happen?