Hello,
I'm just writing to mention that there is a serious problem with Processing 2.0b7 on older Macbook Pro 17" with Radeon X1600.
some sketches using just size(x,y) from the Examples seem to work OK, anything that uses P3D or P2D runs with garbage on screen (like random parts of the graphics buffer flashing)

running SpecTests brings me:

ATI Technologies Inc.
ATI Radeon X1600 OpenGL Engine
2.0 ATI-1.6.36
1.20
GL_ARB_transpose_matrix GL_ARB_vertex_program GL_ARB_vertex_blend GL_ARB_window_pos GL_ARB_shader_objects GL_ARB_vertex_shader GL_ARB_shading_language_100 GL_EXT_multi_draw_arrays GL_EXT_clip_volume_hint GL_EXT_rescale_normal GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_gpu_program_parameters GL_EXT_geometry_shader4 GL_EXT_transform_feedback GL_APPLE_client_storage GL_APPLE_specular_vector GL_APPLE_transform_hint GL_APPLE_packed_pixels GL_APPLE_fence GL_APPLE_vertex_array_object GL_APPLE_vertex_program_evaluators GL_APPLE_element_array GL_APPLE_flush_render GL_APPLE_aux_depth_stencil GL_NV_texgen_reflection GL_NV_light_max_exponent GL_IBM_rasterpos_clip GL_SGIS_generate_mipmap GL_ARB_imaging GL_ARB_point_parameters GL_ARB_texture_env_crossbar GL_ARB_texture_border_clamp GL_ARB_multitexture GL_ARB_texture_env_add GL_ARB_texture_cube_map GL_ARB_texture_env_dot3 GL_ARB_multisample GL_ARB_texture_env_combine GL_ARB_texture_compression GL_ARB_texture_mirrored_repeat GL_ARB_shadow GL_ARB_depth_texture GL_ARB_shadow_ambient GL_ARB_fragment_program GL_ARB_fragment_program_shadow GL_ARB_fragment_shader GL_ARB_occlusion_query GL_ARB_point_sprite GL_ARB_texture_non_power_of_two GL_ARB_vertex_buffer_object GL_ARB_pixel_buffer_object GL_ARB_draw_buffers GL_ARB_shader_texture_lod GL_ARB_half_float_vertex GL_ARB_texture_rg GL_EXT_compiled_vertex_array GL_EXT_framebuffer_object GL_EXT_framebuffer_blit GL_EXT_framebuffer_multisample GL_EXT_texture_rectangle GL_ARB_texture_rectangle GL_EXT_texture_env_add GL_EXT_blend_color GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_texture_lod_bias GL_EXT_abgr GL_EXT_bgra GL_EXT_stencil_wrap GL_EXT_texture_filter_anisotropic GL_EXT_separate_specular_color GL_EXT_secondary_color GL_EXT_blend_func_separate GL_EXT_shadow_funcs GL_EXT_stencil_two_side GL_EXT_texture_compression_s3tc GL_EXT_texture_compression_dxt1 GL_EXT_texture_sRGB GL_EXT_blend_equation_separate GL_EXT_texture_mirror_clamp GL_EXT_packed_depth_stencil GL_EXT_provoking_vertex GL_APPLE_flush_buffer_range GL_APPLE_ycbcr_422 GL_APPLE_rgb_422 GL_APPLE_vertex_array_range GL_APPLE_texture_range GL_APPLE_float_pixels GL_ATI_texture_float GL_ARB_texture_float GL_ARB_half_float_pixel GL_APPLE_pixel_buffer GL_APPLE_object_purgeable GL_NV_blend_square GL_NV_fog_distance GL_ATI_texture_mirror_once GL_ATI_blend_equation_separate GL_ATI_blend_weighted_minmax GL_ATI_texture_env_combine3 GL_ATI_separate_stencil GL_ATI_texture_compression_3dc GL_SGIS_texture_edge_clamp GL_SGIS_texture_lod GL_SGI_color_matrix GL_EXT_vertex_array_bgra GL_ARB_instanced_arrays

(and some garbage on screen too)
I have no trouble running the examples on my windows machine