Differences in paths between gazebo and rosrun gazebo_ros gzserver

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Hi

I have my files in the following structure:

~/faster_dev/branches/yn/gazebo/plugin: mars.world
~/faster_dev/branches/yn/gazebo/models: model database, model.sdf files in subfolders
~/gazebo_source/catkin_ws/src/gazebo_ros_pkgs/gazebo_ros

My environment variables are set up as follows:

GAZEBO_MODEL_PATH=:/home/yn/faster_dev/branches/yn/gazebo/models:/home/yn/faster_dev/trunk/gazebo/models GAZEBO_RESOURCE_PATH=/home/yn/local/share/gazebo-1.9:/home/yn/local/share/gazebo_models:/home/yn/faster_dev/branches/yn/gazebo/plugin:/home/yn/faster_dev/branches/yn/gazebo/models GAZEBO_MASTER_URI=http://localhost:11345 GAZEBO_PLUGIN_PATH=/home/yn/local/lib/gazebo-1.9/plugins:/home/yn/faster_dev/branches/yn/gazebo/plugin/build:/home/yn/faster_dev/trunk/gazebo/plugin/build GAZEBO_MODEL_DATABASE_URI=http://gazebosim.org/models

When I run "gazebo mars.world" from any location the world is loaded with all textures and models found, howvere 'rosrun gazebo_ros gzserver mars.world" can only find the world file if I run the command from folder containing the mars.world file, and in this case a number of resources (png for heightmap and textures) cannot be found.

Is there any difference in the paths or environment variables used by gazebo and gazebo_ros?

Yasho