DRCSIM doesn't start with roslaunch atlas_utils atlas.launch

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Today, I updated all drcsim and gazebo and it's been 4 months since I used those. However, I couldn't start drcsim for some reason. It seems working at first, but it closes after launching the GUI. The below is the last part of the terminal msg. I think it's because of my GPU issue according to some previous questions. My laptops use radeon cards unfortunately. Please let me know how to get it work. I tried to change some drivers (Standard->proprietary->mesa utils), but no luck. I'm a very beginner and it'll be appreciated if someone can explain kindly to fix this issue. Thank you.

>>roslaunch atlas_utils atlas.launch
~~
setting /run_id to e3b3dee4-0a24-11e3-9efe-701a04203eba
process[rosout-1]: started with pid [9145]
started core service [/rosout]
process[gazebo-2]: started with pid [9159]
process[atlas_robot_state_publisher-3]: started with pid [9164]
process[multisense_sl_robot_state_publisher-4]: started with pid [9178]
process[tf2_buffer_server-5]: started with pid [9204]
process[multisense_sl/camera/stereo_proc-6]: started with pid [9234]
Warning [gazebo_main.cc:64] escalating to SIGKILL on client
[gazebo-2] process has finished cleanly
log file: /home/wonyoung/.ros/log/e3b3dee4-0a24-11e3-9efe-701a04203eba/gazebo-2*.log