RunningSimulatorHeadless gazebo problem [closed]

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hello,

Yesterday i installed a new version of gazebo (1.6.7) but when i launch it was too slow and i can't work, then i decide to run it in headless mode, with this command:

roslaunch gazebo_worlds empty_world_no_x.launch

but it remains freeze like this:

jose@ubuntu:~$ roslaunch gazebo_worlds empty_world_no_x.launch
... logging to /home/jose/.ros/log/4643b3c6-3ad3-11e2-afa9-e0ca942b6aa6/roslaunch-ubuntu-3384.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://ubuntu:49363/

SUMMARY
========

PARAMETERS
 * /rosdistro
 * /rosversion
 * /use_sim_time

NODES
  /
    gazebo (gazebo/gazebo)

auto-starting new master
Exception AttributeError: AttributeError("'_DummyThread' object has no attribute '_Thread__block'",) in <module 'threading' from '/usr/lib/python2.7/threading.pyc'> ignored
process[master]: started with pid [3400]
ROS_MASTER_URI=http://localhost:11311

setting /run_id to 4643b3c6-3ad3-11e2-afa9-e0ca942b6aa6
Exception AttributeError: AttributeError("'_DummyThread' object has no attribute '_Thread__block'",) in <module 'threading' from '/usr/lib/python2.7/threading.pyc'> ignored
process[rosout-1]: started with pid [3413]
started core service [/rosout]
Exception AttributeError: AttributeError("'_DummyThread' object has no attribute '_Thread__block'",) in <module 'threading' from '/usr/lib/python2.7/threading.pyc'> ignored
process[gazebo-2]: started with pid [3427]
Gazebo multi-robot simulator, version 1.3.0
Copyright (C) 2012 Nate Koenig, John Hsu, and contributors.
Released under the Apache 2 License.
http://gazebosim.org

Warning [parser.cc:362] Converting a deprecatd SDF source[/home/jose/fuerte_workspace/simulator_gazebo/gazebo_worlds/worlds/empty.world].
Set SDF value
  Version[1.2] to Version[1.3]
  Please use the gzsdf tool to update your SDF files.
    $ gzsdf convert [sdf_file]
[ INFO] [1354268987.501686544]: waitForService: Service [/gazebo/set_physics_properties] has not been advertised, waiting...
Msg Waiting for master
Msg Connected to gazebo master @ http://localhost:11345
[ INFO] [1354268989.348912270, 0.001000000]: joint trajectory plugin missing <updateRate>, defaults to 0.0 (as fast as possible)
[ INFO] [1354268989.379983716, 0.023000000]: waitForService: Service [/gazebo/set_physics_properties] is now available.
[ INFO] [1354268989.427228769, 0.068000000]: Starting to spin physics dynamic reconfigure node...

What can i do?, any idea??...