I seem to have 2 different passphrases set

I am running Encryption Desktop 10.2.1 on OSX 10.7.5.  As far as I know all I am doing is whole disk encryption, and when I boot the bootguard asks me for my passphrase, and I give it and the machine boots and my applications start successfully.  But within a day or 2, another small window pops up asking for me to enter the passphrase for the "key" shown above - and it is my user name.  I attempt to enter the passphrase I used at boot, but the "ok" button is greyed out.  I try my previous passphrase and the "ok" button is still greyed out.

What is this "key" passphrase being requested?  Can I just hit cancel?  I seem able to run whatever I need to, open whatever I need to.