problem with insider build for windows and git

[Michael Gooch]

when running commands like pull and clone I get the following message:
Cygwin WARNING:
  Couldn't compute FAST_CWD pointer.  This typically occurs if you're using
  an older Cygwin version on a newer Windows.  Please update to the latest
  available Cygwin version from https://cygwin.com/.  If the problem 
persists,
  please see https://cygwin.com/problems.html

Windows build is version 1607, OS BUILD 15002.1001

I assume they broke something that cygwin was depending on.