When I try to render the skybox with GLSL, the posy texture is displayed on the bottom, and the negy texture is displayed on the top. I can’t find the reason…
I don’t think thats even possible unless you’ve mixed up the images in your texture loader.
Also verify that the images are not vertically flipped, many formats (TGA,BMP) store images upside down. DDS on the other hand are not flipped (though I’m not entirely sure if/how this affects cubemapping in GL).