I updated a site to Drupal 7.14 today, and immediately afterward began receiving reports from users that they were unable to post comments on the site. Drupal's error log reports the following:
Illegal choice 0 in notify_type element.
I disabled Comment Notify, and the error disappeared and users are now able to successfully post comments again. Has something in Drupal 7.14 changed that Comment Notify relies upon? I tried updating to the latest Comment Notify dev release, but encountered the same error. I'm trying to track down which line of code is causing the issue, but no success yet.