prompt to run ecryptfs-unwrap-passphrase long after filesystem was encrypted

I set up this system with encrypted home directory when I first installed it, quite some months ago now. Today shortly after logging in I am getting the pop-up dialog inviting me to run ecryptfs-unwrap-passphrase. It is not at all clear why this is happening now. Is this a phising attempt by nazi hackers trying to get the keys to my precious filesystem secrets?

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: ecryptfs-utils 100-0ubuntu1.1
ProcVersionSignature: Ubuntu 3.5.0-23.35-generic 3.5.7.2
Uname: Linux 3.5.0-23-generic x86_64
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
Date: Tue Feb 19 13:23:44 2013
EcryptfsInUse: Yes
InstallationDate: Installed on 2012-06-10 (254 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MarkForUpload: True
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ecryptfs-utils
UpgradeStatus: Upgraded to quantal on 2012-11-03 (108 days ago)