I just upgraded to Media Compser 8.6.5.44425 and macOS Sierra 10.12.1. on iMac 5K, 4 GHz i7 with 32 GB ram. Now I can't out put my project to XDCAM using Sony PDW-U1 drive. Media Composer did not recognize the drive. I also tried updating XDCAM Drive Utilty to version 5.0.6, it still didn't work. I couldn't even format the disc. Anyone has this problem? Do I need to update U1 driveer? Please help..I have the show that need to be out in 2 days. 

Did you uninstall tha Sony AMA plug in and install the new (Sony replacement) Nablet AMA plug in as required. See Kevins post here

Yes, I did

I have been following this same issue on my system.  I found this post on Creative Cow.

"Answer from sony professional support:

Good morning

I am so sorry for the delay on this, we had to check with Japan, they have just advised that the earliest release date will be the end of January 2017.

Thank you

Kind regards

Lucy Young"

The site they are referring to is https://www.sony.jp/xdcam/support/download/drive_software_download.html