i recently wanted to try some of the new opengl 3.2 features. however as soon as i choose an opengl 3.2 context using wglCreateContextAttribsARB my 1 component GL_ALPHA textures no longer work ( the glsl shader texture lookup functions always return 0). everything is fine if i switch to opengl 3.1 or 2.1. the problem is gone if i exchange the GL_ALPHA textures by GL_RGB.
i tested everything under windows xp pro x64 and the nvidia driver 191.07.
do i have to do something new with respect to opengl 3.2 or is it a driver bug?