I had a similiar problem, but my problems were fixed when I changed the renderMethod in the world file.  Give this a try for ATI card users:

   <model:ObserverCam>
      5     <id>userCam0</id>
      6     <xyz>5.637 93.859 3.053</xyz>
      7     <rpy>-0 13 -39</rpy>
      8     <imageSize>640 480</imageSize>
      9     <updateRate>10</updateRate>
     10     <renderMethod>GLXP</renderMethod>
     11   </model:ObserverCam>


Nate Koenig <natekoenig@gmail.com> wrote:
Hello,

ATI cards do not support pbuffers. Please read the documentation:
http://playerstage.sourceforge.net/doc/Gazebo-manual-0.5-html/gazebo_opengl.html

-nate

On 11/27/05, Konstantinos Dalamagkidis wrote:
> Hi,
>
> Similar problems here and as usual ATI mobility behind them :(
> I've tried both the released and the CVS versions and the latest ATI
> driver but with no success.
> It is working fine with GLX:
> using display [:0.0]
> rendering: [GLX offscreen] direct [no] RGBA [8 8 8 8] depth [24]
> server id [0]
> connecting to server
> opening simulator interface
> waiting for data
>
> But when i try GLXP (or SGIX), i get this:
> using display [:0.0]
> error : camera initialization failed: no rendering context
> Initialization failed
> server died
>
> Any advice before i throw both the ATI card and the laptop away...?
>
> Thanx
>
> dalai
>
>
> fgl_glxgears:
> Using GLX_SGIX_pbuffer
> 1752 frames in 5.0 seconds = 350.400 FPS
>
> glxgears:
> 10322 frames in 5.0 seconds = 2064.400 FPS
>
> glxinfo:
> name of display: :0.0
> display: :0 screen: 0
> direct rendering: Yes
> server glx vendor string: SGI
> server glx version string: 1.2
> server glx extensions:
> GLX_ARB_multisample, GLX_EXT_visual_info, GLX_EXT_visual_rating,
> GLX_EXT_import_context, GLX_OML_swap_method, GLX_SGI_make_current_read,
> GLX_SGIS_multisample, GLX_SGIX_fbconfig
> client glx vendor string: ATI
> client glx version string: 1.3
> client glx extensions:
> GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_import_context,
> GLX_ARB_get_proc_address, GLX_ARB_multisample,
> GLX_ATI_pixel_format_float,
> GLX_ATI_render_texture
> GLX extensions:
> GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_import_context,
> GLX_ARB_multisample
> OpenGL vendor string: ATI Technologies Inc.
> OpenGL renderer string: FireMV 2400 PCI DDR Generic
> OpenGL version string: 1.3.1017 (X4.3.0-8.19.10)
> OpenGL extensions:
> GL_ARB_multitexture, GL_EXT_texture_env_add,
> GL_EXT_compiled_vertex_array,
> GL_S3_s3tc, GL_ARB_occlusion_query, GL_ARB_point_parameters,
> GL_ARB_texture_border_clamp, GL_ARB_texture_compression,
> GL_ARB_texture_cube_map, GL_ARB_texture_env_add,
> GL_ARB_texture_env_combine, GL_ARB_texture_env_crossbar,
> GL_ARB_texture_env_dot3, GL_ARB_texture_mirrored_repeat,
> GL_ARB_transpose_matrix, GL_ARB_vertex_blend,
> GL_ARB_vertex_buffer_object,
> GL_ARB_vertex_program, GL_ARB_window_pos, GL_ATI_element_array,
> GL_ATI_envmap_bumpmap, GL_ATI_fragment_shader, GL_ATI_map_object_buffer,
> GL_ATI_texture_env_combine3, GL_ATI_texture_mirror_once,
> GL_ATI_vertex_array_object, GL_ATI_vertex_attrib_array_object,
> GL_ATI_vertex_streams, GL_ATIX_texture_env_combine3,
> GL_ATIX_texture_env_route, GL_ATIX_vertex_shader_output_point_size,
> GL_EXT_abgr, GL_EXT_bgra, GL_EXT_blend_color,
> GL_EXT_blend_func_separate,
> GL_EXT_blend_minmax, GL_EXT_blend_subtract, GL_EXT_clip_volume_hint,
> GL_EXT_draw_range_elements, GL_EXT_fog_coord, GL_EXT_multi_draw_arrays,
> GL_EXT_packed_pixels, GL_EXT_point_parameters, GL_EXT_rescale_normal,
> GL_EXT_secondary_color, GL_EXT_separate_specular_color,
> GL_EXT_stencil_wrap, GL_EXT_texgen_reflection, GL_EXT_texture3D,
> GL_EXT_texture_compression_s3tc, GL_EXT_texture_cube_map,
> GL_EXT_texture_edge_clamp, GL_EXT_texture_env_combine,
> GL_EXT_texture_env_dot3, GL_EXT_texture_filter_anisotropic,
> GL_EXT_texture_lod_bias, GL_EXT_texture_mirror_clamp,
> GL_EXT_texture_object, GL_EXT_texture_rectangle, GL_EXT_vertex_array,
> GL_EXT_vertex_shader, GL_HP_occlusion_test, GL_NV_blend_square,
> GL_NV_occlusion_query, GL_NV_texgen_reflection, GL_SGI_color_matrix,
> GL_SGIS_generate_mipmap, GL_SGIS_texture_border_clamp,
> GL_SGIS_texture_edge_clamp, GL_SGIS_texture_lod,
> GL_SUN_multi_draw_arrays
> glu version: 1.3
> glu extensions:
> GLU_EXT_nurbs_tessellator, GLU_EXT_object_space_tess
>
> visual x bf lv rg d st colorbuffer ax dp st accumbuffer ms cav
> id dep cl sp sz l ci b ro r g b a bf th cl r g b a ns b eat
> ----------------------------------------------------------------------
> 0x23 24 tc 0 32 0 r y . 8 8 8 8 0 24 8 16 16 16 16 1 0 Slow
> 0x24 24 tc 0 32 0 r . . 8 8 8 8 0 24 8 16 16 16 16 1 0 Slow
> 0x25 24 tc 0 32 0 r y . 8 8 8 8 0 24 0 16 16 16 16 1 0 Slow
> 0x26 24 tc 0 32 0 r . . 8 8 8 8 0 24 0 16 16 16 16 1 0 Slow
> 0x27 24 tc 0 32 0 r y . 8 8 8 8 0 24 8 0 0 0 0 1 0 None
> 0x28 24 tc 0 32 0 r . . 8 8 8 8 0 24 8 0 0 0 0 1 0 None
> 0x29 24 tc 0 32 0 r y . 8 8 8 8 0 24 0 0 0 0 0 1 0 None
> 0x2a 24 tc 0 32 0 r . . 8 8 8 8 0 24 0 0 0 0 0 1 0 None
> 0x2b 24 dc 0 32 0 r y . 8 8 8 8 0 24 8 16 16 16 16 1 0 Slow
> 0x2c 24 dc 0 32 0 r . . 8 8 8 8 0 24 8 16 16 16 16 1 0 Slow
> 0x2d 24 dc 0 32 0 r y . 8 8 8 8 0 24 0 16 16 16 16 1 0 Slow
> 0x2e 24 dc 0 32 0 r . . 8 8 8 8 0 24 0 16 16 16 16 1 0 Slow
> 0x2f 24 dc 0 32 0 r y . 8 8 8 8 0 24 8 0 0 0 0 1 0 None
> 0x30 24 dc 0 32 0 r . . 8 8 8 8 0 24 8 0 0 0 0 1 0 None
> 0x31 24 dc 0 32 0 r y . 8 8 8 8 0 24 0 0 0 0 0 1 0 None
> 0x32 24 dc 0 32 0 r . . 8 8 8 8 0 24 0 0 0 0 0 1 0 None
>
>
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