Specifications: Gnome Disk Utility v.3.0.2 running on 12.04 LTS on a generic AMD64 box used to partition a HDD interfaced via SATA and create the file-system. Options defined were the following: No partitioning/table & EXT4 file-system with the encryption option selected. Everything default from the kernel up; all packages, setting, etc.
Details: The pass-phrase defined at the time of setup was too long and complex making it rather inconvenient to "unlock" the volume. I believe a typo was made so far as the actual passphrase defined at initial set up when compared to the what was documented as the passphrase. Eventually I got the volume unlocked after many unsuccessful attempts. The option selected at this time was "remember passphrase forever" (or until logout, I forget) for the system to remember the passphrase indefinitely. I immediately attempted to use the "change passphrase" option. With the sucessfull passphrase in the programs memory, I entered a new passphrase. I've tried several times to change the passphrase and I continually get the following error: "Incorrect passphrase, try again."
I do not know what to do and any help would be dearly appreciated.