I'm having similar issues with point sprites and textures. I can't get PointSize to work right, images are garbled or flipped upside down, depending on if I include a fragment shader. Please help - I'm ripping my hair out as this works on a dozen other Intel/ATI/Nvida platforms I've tested it on.
Should I repost this discussion thread in this area? I'm not sure what the diff is between communities.intel.com and software.intel.com