the service gazebo/set_physics_properties seems stoped, always waiting.
When I run "roslaunch gazebo_ros willowgarage_world.launch", it is stop on following:
Why? does anybody meet the same problem? following is some log
roslaunch gazebo_ros willowgarage_world.launch ... logging to /home/tq/.ros/log/61463594-1428-11e7-9c2d-e84e0619bcda/roslaunch-tq-ml-11535.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://tq-ml:41574/
PARAMETERS * /rosdistro: kinetic * /rosversion: 1.12.7 * /use_sim_time: True
NODES / gazebo (gazebo_ros/gzserver) gazebo_gui (gazebo_ros/gzclient)
auto-starting new master process[master]: started with pid  ROS_MASTER_URI=http://localhost:11311
setting /run_id to 61463594-1428-11e7-9c2d-e84e0619bcda process[rosout-1]: started with pid  started core service [/rosout] process[gazebo-2]: started with pid  process[gazebo_gui-3]: started with pid