I just had a very informative talk with Pioneer tech support (USA) and why they are not yet supporting the firmware 1.15 for the 107D burner. While they were not sure he led me to believe that there might be some stability problems with region 1 drives and that their tech people were holding off to see what they could do before they release the new version for USA.
I asked him to try to convince them to post what they find when they finally release it, especially concerning what to do if you have the 1.15 from AU or elsewhere. He did agree that this delay had not happened before in his memory.
Any additional info from anyone else would be great. I have been using the 1.15 since its release and so far have had no difficulties.