Possibly related to the new verified-users, unverified-users groups. If your forum had the require email confirmation setting on and you upgraded then registered-users no longer have posting privileges. This is done by the upgrade scripts. But if you reverted without doing a database restore then registered-users won't have the privileges back.
email and user parsing conflict
Where do you see this? I created an user with an email in the form of
<email@example.com>but I got
@baris i see it here, if you want to type your email link on a post
So like this
Seems like a bug in the markdown parser.