'ls' can't find '.' in root directory

[Lee Rothstein]

--
$ ls
ls: reading directory .: No such file or directory
_C  _root_files  bin  dev  etc  home  lib  local  opt  sbin  srv  tmp  
usr  var  z  zup
--
Cygwin version: 1.7.9-1

Don't know when this problem started vis a vis updates. Attached is 
cygcheck output.

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