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Gazebo grass/pavement plane flickering

Hi all,

I built a simple model of outdoor environment using grass plane and pavement plane models (from DRC simulator database). My world file looks like this:

<?xml version='1.0'?>
<sdf version='1.4'>
  <world name='default'>
    <light name='sun' type='directional'>
      <pose>0.000000 0.000000 10.000000 0.000000 0.000000 0.000000</pose>
      <diffuse>0.800000 0.800000 0.800000 1.000000</diffuse>
      <specular>0.200000 0.200000 0.200000 1.000000</specular>
      <direction>0.500000 0.100000 -0.900000</direction>

    <pose>0 0 0   0 0 0</pose>

      <physics type='ode'>
      <gravity>0.000000 0.000000 -9.800000</gravity>
      <ambient>0.400000 0.400000 0.400000 1.000000</ambient>
      <background>0.700000 0.700000 0.700000 1.000000</background>

    <state world_name='default'>
      <sim_time>0 0</sim_time>
      <real_time>0 207512</real_time>
      <wall_time>1372662656 276170409</wall_time>
    <gui fullscreen='0'>
      <camera name='user_camera'>
        <pose>3.082640 -6.458740 2.425810 0.000000 0.367643 2.028200</pose>

  <!-- road segment ******************************    -->  
    <pose>0 0 0   0 0 0</pose>

    <pose>0 -1 0   0 0 0</pose>

    <pose>0 2 0   0 0 0</pose>

    <pose>0 1 0   0 0 0</pose>

    <pose>0 -2 0   0 0 0</pose>


When moving camera in Gazebo GUI planes are somehow flickering - at some position it looks good but in some other there are "holes". Also images published by robot cameras are flickering too.

See pict1, or pict2 (can't upload here because of karma).

I tried to downscale textures but it's same. Any ideas? Thanks in advance.