Hi From Belgium, I've same problem on 2 computers : MacBook12 (2015) and MacbookPro15 (2017). Both are in MacOS X Sierra and Parallels 13 (last update) ON MACKBOOK12: When Windows 10 (v1703) try to upgrade to the v1709 , in the upgrade process , it show me a error message that some material drivers are not compatible and the came back to previous windows version. (( ON MACBOOKPRO15: When Windows 10 (v1703) try to upgrade to the v1709 , after upgrade done, impossible to access to the user. After write the user password, the screen come black and freeze. (( I of course tried many time, do a reset of the parallels WM, etc.... Is someone have the same problem? I've search on in internet and in this forum but found nothing about. (( Regards Stephane D.