Comment 4 for bug 937602

Using "retain_after_close" may work as a temporary work around, but it does not fix the bug.

The fact that using retain_after_close will prevent the clearing of the credentials cache on login is a strong hint that to what the bug is. It now seems very likely that 'lxdm' is closing the just created session during initiation. The session should only be closed on logout.

Notice that using retain_after_closed has some security implications as you leave your credentials behind after closing a session.