"roslaunch gazebo_ros willowgarage_world.launch" with dying gazebo-gui

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Hello, when I type

roslaunch gazebo_ros willowgarage_world.launch

from http://gazebosim.org/tutorials/?tut=r...

the first time, everything works fine. But when I Ctrl+C the terminal or close the terminal and later type the command again, it says

[gazebo_gui-3] process has died [pid 3589, exit code 134, cmd /opt/ros/indigo/lib/gazebo_ros/gzclient __name:=gazebo_gui __log:=/home/hurlbrink/.ros/log/db470810-f2d8-11e3-a7eb-bc305be4e785/gazebo_gui-3.log].log file: /home/hurlbrink/.ros/log/db470810-f2d8-11e3-a7eb-bc305be4e785/gazebo_gui-3*.log

(The log file from the text does not exist).

After that I have to restart my computer until it works again.

How to solve the problem? I want to use the command without restarting everytime.

Seems that the roslaunch processes from the first time are not finished cleanly. Maybe I need a method to finish all roslaunch started processes cleanly, when Ctrl+C does not work.