MacOS High Sierra 10.13.1, Bootcamp, APFS and Windows 10 Build 1709 problem

So, if you have a MacBook Pro and run Bootcamp with Windows you are used to switching between OSX (macOS) and Windows.  Either by using the Windows system tray silver diamond and selecting the "restart in macOS" option or by switching off the PC and then restarting to see the Startup Manager.  But, after upgrading the mac to macOS High Sierra and then upgrading to Windows 10 build 1709 this "restart in macOS" no longer works. First thing to try is to downgrade back to the previous Windows version.  But that doesn't work.

Fixed Income Electronic Trading, MiFID2 and Jarvis Cocker

"Is this the way they say the future's meant to feel?
Or just 20,000 people standing in a field?
And I just don't understand quite what this feeling is..."
--Jarvis Cocker (Pulp, Sorted for E's and Wizz)

Fixed Income Leaders Summit Amsterdam 2017

This year is shaping up to be superb.  I am really looking forward to the Dragon's Den session - I am delighted to see a "graduate" from a previous year join us as a Dragon and I'm very proud to say that the three firms pitching are all firms I have found through my consulting work.