This may or may not be blacklist-related, however, after installing 2.6.1 on WP 1.2.1, I realized that I was receiving email notification for all comments. I'd never had the notification check box turned on. Now, even after turning off the requirement to fill in a name and email address, I continue to get email requests for comment moderation. And alas, my programming prowess is insufficient to find the correct code snippet that might contain a "1" where a "0" would serve better.
Have you heard of this problem and/or do you think it could be plugin related?
Thanks for your time.