So if you join or create a party, and log off after doing so, you're basically stuck in the party. When you try to leave, it tell you that you've left, but when you try and create a new one, you can't because it says you're still in the party... You can't pvp anyone in the party or join new parties so hopefully you can fix this bug. This is the message that shows up when you try and leave/join or create a party.
http://i.imgur.com/k1SnOBZ.png