When I am editing my party in the SP or MP Keep, the world chat keeps randomly opening up and I need to close it. It doesn't seem to be tired to any button presses or mouse clicks, it just randomly opens up sometimes.
I do have the Co-op chat open, by accident. Does it open up whenever someone posts something there? I should close it in that case.
Many people have commented on the same issue in World chat, the co-op chat tab seems to be the culprit. It needs to be closed with the Close button to prevent the jack-in-the-box behaviour.