I upgraded to 1.84, and none of my unsubscribe links for existing subscribers work. The error message is:
Your email address (!email) was not found in our database! This error should never happen, please contact the administrator of this web site for a manual removal.
This also happens to users who have been added (or joined) since the upgrade. I have tried a number of different email addresses, and all have the same results.
Thoughts?