Ignition Ign-Rendering not showing textures/materials

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I have a custom .world file for gazebo, made all the SDF's correctly, works perfectly in Gazebo, runs correctly in gzserver and displays all the materials correctly in gzclient. When editing the example gazebo_scene_viewerto match my requirements and make a custom visualizer, i noticed that non of the materials were displayed, but they are displayed in gzclient. Experimenting with one of Ignition tutorials and the example worlds (http://gazebosim.org/blog/rendering_a...) the materials/colors/textures are loaded correctly, but they are defined differently in the SDF file, as follows.

WORKING (falling_objects.world)

<model name="south_model">
      <pose>0 0 0 0 0 0</pose>
      <static>false</static>
      <link name="south_link">
        <pose>7 0 -2 0 0 0</pose>
        <collision name="south_collision">
          <geometry>
            <sphere>
              <radius>0.75</radius>
            </sphere>
          </geometry>
        </collision>

        <visual name="south_visual">
          <geometry>
            <sphere>
              <radius>0.75</radius>
            </sphere>
          </geometry>
          <material>
            <ambient>0.3 0.0 0.0 1</ambient>
            <diffuse>0.7 0.0 0.0 1</diffuse>
            <specular>0.5 0.5 0.5 1</specular>
          </material>
        </visual>
      </link>
    </model>

NOT WORKING(custom.world)

<model name="RoboCup MSL Ball">
    <static>false</static>
    <link name="ball">
      <inertial>
        <mass>0.43</mass>
        <!-- inertia based on solid sphere 2/5 mr^2 -->
        <inertia>
          <ixx>0,0020812</ixx>
          <iyy>0,0020812</iyy>
          <izz>0,0020812</izz>
          <ixy>0</ixy>
          <ixz>0</ixz>
          <iyz>0</iyz>
        </inertia>
      </inertial>
      <collision name="collision">
        <geometry>
          <sphere>
            <radius>0.11</radius>
          </sphere>
        </geometry>
      </collision>
      <visual name="visual">
        <geometry>
          <sphere>
            <radius>0.11</radius>
          </sphere>
        </geometry>
        <material>
          <script>
            <uri>file://media/materials/scripts/gazebo.material</uri>
            <name>Gazebo/RedBright</name>
          </script>
        </material>
      </visual>
    </link>
  </model>

USING GAZEBO : GZSERVER+GZCLIENT

CUSTOM WORLD

FALLING OBJECTS

USING GZSERVER + CUSTOM OPENGL VISUALIZER

CUSTOM WORLD

FALLING OBJECTS

Also, any hint on why the FPS are so low? Nvidia usage in below 45%, memory below 35% ... Thanks in advance!

Pedro Silva, RoboCup' MSL's MinhoTeam Researcher