And I get this new series of errors (I really haven't done anything since yesterday!): "from glUseProgramObjectARB @ glsl_shader.c / 3406 fixme:d3d_shader:shader_glsl_load_constants >>>>>>>>>>>>>>>>> GL_INVALID_OPERATION (0x502) from glUniform4fvARB @ glsl_shader.c / 429 fixme:d3d_draw:drawStridedFast >>>>>>>>>>>>>>>>> GL_INVALID_OPERATION (0x502) from glDrawArrays @ drawprim.c / 278 fixme:d3d_shader:shader_glsl_select >>>>>>>>>>>>>>>>> GL_INVALID_OPERATION (0x502) from glUseProgramObjectARB @ glsl_shader.c / 3406 fixme:d3d_shader:shader_glsl_load_constants >>>>>>>>>>>>>>>>> GL_INVALID_OPERATION (0x502) from glUniform4fvARB @ glsl_shader.c / 429 fixme:d3d_shader:shader_glsl_load_constantsF >>>>>>>>>>>>>>>>> GL_INVALID_OPERATION (0x502) from glUniform4fvARB() @ glsl_shader.c / 266 fixme:d3d_shader:shader_glsl_load_constants >>>>>>>>>>>>>>>>> GL_INVALID_OPERATION (0x502) from glUniform4fvARB @ glsl_shader.c / 429 fixme:d3d_draw:drawStridedFast >>>>>>>>>>>>>>>>> GL_INVALID_OPERATION (0x502) from glDrawArrays @ drawprim.c / 278 fixme:d3d_draw:drawStridedFast >>>>>>>>>>>>>>>>> GL_INVALID_OPERATION (0x502) from glDrawArrays @ drawprim.c / 278 I really don't know where to smash my head! Could it be that list of libraries in the config causing this? Ah! And that series of errors repeats itself recursively during the process...