I'm seeing that message on the comments of any of my posts with any theme I use (including the default).
If the user is not logged in, the following message will appear:
"Logged in as . Logout Â»"
Since it thinks the user is logged in, there are no options to enter your information and post a comment.
For reference, here are the comment options I have enabled:
Before a comment appears:
* Comment author must fill out name and e-mail
* Comment author must have a previously approved comment
Are there any known issues/solutions to this?