NV 56.55 returns 4 for MAX_VERTEX_TEXTURE_IMAGE_UNITS_ARB on my GF 5900 XT. But if I try to use a texture sampler in an ARB_vertex_shader program, I get a compiler error about missing support for texture lookups in vertex shaders. Is this due to the beta status of the GLslang support in the drivers? Will there be support for texture lookups in vertex shaders even on GF 5x00 level hardware in the future?