...

 Before you logoff, make sure you still have AFS Tokens (check for the absence
of the red X over the lock icon in the system tray). Without AFS Tokens,
Windows will be unable to write your profile back to the windows_profile
folder in your AFS directory.

To keep your private data private, logout of Windows by choosing "Log Off" from the Start menu. 

 AFS Folders

 The toplevel of the CNF AFS cell is mapped to the X: drive.

...