Wait, do you even logout from that session? If you open a new session, do whatever, then logout and try to login again it creates the issue. For example I have a base installation of openSUSE 13.2 Xfce with xrdp. I login thru xrdp to my machine (VirtualBox) and then just logout, not close the window (that means I do not leave my session running) and then try to login again and will not work anymore.