It blocks feedburner. When you ping it says no- 403-bad behavior. From another post somewhere I read that it might be an issue. So, I deactivated BB (cleared cache) and got a "null" when trying to ping. So, I deleted BB and ping worked correctly and rss posted immediately.
I appreciate that this might not be viewed for a while by the plugin author but I just didn't want to register for a new account with a plugin to report this. Maybe a form with captcha?