the session management will fail if you connect to a X2Go server and your default login shell deviates from a BASH. reason: any client tries to export the host environment variable before it starts x2glistsession. export only works for BASH and not e.g. for tcsh.
if someone is responding to that bug-report i can offer a workaround .. (i just want to find out if someone is interested in ;)
cheers armin