I can't see or enable Shiny even though I have a relatively decent graphics card.
It's an nvidia FX 5200 with 64MB of RAM (Creative Labs 3D Blaster).
I *can* see Shiny by hacking featuretable.txt though! I've done it in the past, although I am presently running a non-hacked SL.
Today I noticed this error in the console: "WARNING Unknown feature mask NVIDIA" which sounds like it might be related. It says feature mask after all

INFO Initializing window...
WARNING No ARB WGL render texture extensions
INFO No 32 bit z-buffer, trying 24 bits instead
INFO Choosing pixel formats: 20 pixel formats returned
INFO Swap Method: Exchange
INFO GL buffer: Color Bits 32 Alpha Bits 8 Depth Bits 24
INFO Disabling vertical sync
INFO Previous gamma: 1
WARNING Unknown feature mask NVIDIA
INFO Creating LLAGPMemPoolNV
INFO Allocated 33554432 bytes of AGP memory
INFO GL_VENDOR NVIDIA Corporation
GL_RENDERER GeForce FX 5200/AGP/3DNOW!
GL_VERSION 1.5.2
GL_EXTENSIONS:
GL_ARB_depth_texture
GL_ARB_fragment_program
GL_ARB_fragment_program_shadow
GL_ARB_fragment_shader
GL_ARB_imaging
GL_ARB_multisample
GL_ARB_multitexture
GL_ARB_occlusion_query
GL_ARB_point_parameters
GL_ARB_point_sprite
GL_ARB_shadow
GL_ARB_shader_objects
GL_ARB_shading_language_100
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_dot3
GL_ARB_texture_mirrored_repeat
GL_ARB_texture_rectangle
GL_ARB_transpose_matrix
GL_ARB_vertex_buffer_object
GL_ARB_vertex_program
GL_ARB_vertex_shader
GL_ARB_window_pos
GL_S3_s3tc
GL_EXT_texture_env_add
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_compiled_vertex_array
GL_EXT_Cg_shader
GL_EXT_draw_range_elements
GL_EXT_fog_coord
GL_EXT_multi_draw_arrays
GL_EXT_packed_pixels
GL_EXT_paletted_texture
GL_EXT_pixel_buffer_object
GL_EXT_point_parameters
GL_EXT_rescale_normal
GL_EXT_secondary_color
GL_EXT_separate_specular_color
GL_EXT_shadow_funcs
GL_EXT_shared_texture_palette
GL_EXT_stencil_two_side
GL_EXT_stencil_wrap
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
GL_EXT_texture_lod_bias
GL_EXT_texture_object
GL_EXT_vertex_array
GL_HP_occlusion_test
GL_IBM_rasterpos_clip
GL_IBM_texture_mirrored_repeat
GL_KTX_buffer_region
GL_NV_blend_square
GL_NV_copy_depth_to_color
GL_NV_depth_clamp
GL_NV_fence
GL_NV_float_buffer
GL_NV_fog_distance
GL_NV_fragment_program
GL_NV_fragment_program_option
GL_NV_half_float
GL_NV_light_max_exponent
GL_NV_multisample_filter_hint
GL_NV_occlusion_query
GL_NV_packed_depth_stencil
GL_NV_pixel_data_range
GL_NV_point_sprite
GL_NV_primitive_restart
GL_NV_register_combiners
GL_NV_register_combiners2
GL_NV_texgen_reflection
GL_NV_texture_compression_vtc
GL_NV_texture_env_combine4
GL_NV_texture_expand_normal
GL_NV_texture_rectangle
GL_NV_texture_shader
GL_NV_texture_shader2
GL_NV_texture_shader3
GL_NV_vertex_array_range
GL_NV_vertex_array_range2
GL_NV_vertex_program
GL_NV_vertex_program1_1
GL_NV_vertex_program2
GL_NV_vertex_program2_option
GL_SGIS_generate_mipmap
GL_SGIS_texture_lod
GL_SGIX_depth_texture
GL_SGIX_shadow
GL_SUN_slice_accum
GL_WIN_swap_hint
WGL_EXT_swap_control
WGL_ARB_buffer_region
WGL_ARB_extensions_string
WGL_ARB_make_current_read
WGL_ARB_multisample
WGL_ARB_pbuffer
WGL_ARB_pixel_format
WGL_ARB_render_texture
WGL_EXT_extensions_string
WGL_EXT_swap_control
WGL_NV_float_buffer
WGL_NV_render_depth_texture
WGL_NV_render_texture_rectangle
INFO Viewer Digest: d7dab05e-e834-d565-bd59-999c2aee0742
INFO Couldn't open pilot.txt, aborting agentpilot load!
INFO Resend: 25000
INFO Land: 34000
INFO Wind: 7800
INFO Cloud: 7800
INFO Task: 70800
INFO Texture: 54600
INFO Asset: 50000
INFO Total: 250000
INFO Initializing messaging system...
INFO Message template checksum = b97cbad1
INFO attempting to connect on port 12034
INFO connected on port 12034
INFO startNet - receive buffer size : 400000
INFO startNet - send buffer size : 400000
INFO Message template version matches prehash version number
INFO LLXferManager ack throttle min rate: 2.66667e+006
INFO LLXferManager ack throttle actual rate: 2.93333e+006
INFO LLXferManager ack throttle min rate: 8000
INFO LLXferManager ack throttle actual rate: 150000
INFO AssetStorage: Setting upstream provider to 0.0.0.0:12036
INFO LLAudioEngine_FMOD::init() initializing FMOD
INFO LLAudioEngine_FMOD::init() FMOD initialized correctly
WARNING Unreliable timers detected (may be bad PCI chipset)!!

