fwiw, I just started having the same problem with my LG GCC-H20L BD/HD, and a fresh install of Win7 x64. I put a blu ray in, and it doesn't recognize it, just sits there scanning the disk over and over again.
I dual booted back to my older, non-fresh Win7 x64, and it works fine with the drive. I can't figure out what's different between them yet. Since the drive works, it has to be a drivers issue in the new Win7 install.