Here you go Stephen
Sorry it’s a long thread. The fix is in it.
Short version there was a bug in 16.0.0 and 16.0.1
Theted a couple different ways to fix it but in short you’re grabbing a backup copy of your flows reverting to 15.x, restoring your stuff. Killing a folder (to prevent recurrence) then ensuring NR starts properly. Once it does you’re clear to upgrade to 16.0.2