Gazebo 1.8.1 turns into black

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Hello,

I'm trying to launch my own world of a circuit but it is not possible, Gazebo turns into black and I cannot see my world with my robot. I can connect to the robot cameras but I don't see anything. The model of the circuit is the following:

<?xml version="1.0" ?>
<sdf version="1.4">
  <model name="heightmap">
    <static>true</static>
    <link name="link2">
      <visual name="visual">
        <geometry>
          <heightmap>     
            <texture>
              <diffuse>file://media/materials/textures/terrain_detail.jpg</diffuse>
              <normal>file://media/materials/textures/terrain_detail.jpg</normal>
              <size>50</size>
            </texture>
            <texture>
              <diffuse>file://media/materials/textures/flat_normal.png</diffuse>
              <normal>file://media/materials/textures/flat_normal.png</normal>
              <size>50</size>
            </texture>
            <texture>
              <diffuse>file://media/materials/textures/beigeWall.jpg</diffuse>
              <normal>file://media/materials/textures/flat_normal.png</normal>
              <size>20</size>
            </texture>  
            <blend>
              <min_height>0</min_height>
              <fade_dist>0</fade_dist>
            </blend>
            <blend>
              <min_height>0.01</min_height>
              <fade_dist>0</fade_dist>
            </blend>     
            <uri>model://jarama/images/jaramaCircuitoRetocado.png</uri>
            <size>50 50 1</size>
            <pos>0 0 0</pos>
          </heightmap>
        </geometry>
      </visual>
    </link>
  </model>
</sdf>

Basically it loads a black&white image with the circuit and constructs it with walls and a blue line. It is to do a follow-line behaviour based on the Pioneer 2DX.

I'm running Gazebo on Ubuntu 13.04 64bits. In Ubuntu 12.04 64bits I can load this world but it works so slowly because of not having drivers of my integrated graphic card (Intel HD4000), now developed for Ubuntu 13.04.

Do you know if I'm missing something or if I can fix that?

Thank you,

Borja.