Hope this helps, I have been trying out new firmware and for some reason GLOC gives me the best results. I have been having tons of issues with GOLF and GLOG were the player will give me write errors and it will not maintain top speed throughout the write. I'm using some cheap Phillips DVD-R (CMC MAG AM3) and I was getting goos results after GLOC but when I started changing to the latest the player was doing all kinds of weird stuff. Even the disc would show spots and lines.
My Writer came with an old version initially and it sucked, then I updated to GLOC and it worked great, but with all the new ones it also sucks. Don't know if anybody has been experiencing similar results or if you are, then try reflashing the older GLOC. I was going to RMA the drive but then I decided to reflash the old that I had positive results before and it seams to be working good now.
Any comments from anybody would be good.