7.4.5 stopped working?

I had the latest cygwin postgres (as of yesterday) working when I went
home last night and this morning I cant start the postmaster.  I cant
think of anything that changed.

$ uname -a
CYGWIN_NT-5.0 kgb 1.5.11(0.116/4/2) 2004-09-04 23:17 i686 unknown unknown Cygwin

$ postmaster --version
postmaster (PostgreSQL) 7.4.5

cygserver starts and stays running.  last night it was a process and
thats how I started it this morning.  in trying to work out what's
happening, i've installed the service now.

$ /usr/sbin/cygserver --version
cygserver: (cygwin) 1.10
API version 1.5.11(0.116/4/1)-(3.0.0.2) 2004-09-04 23:17
Copyright 2001, 2002, 2003 Red Hat, Inc.
Compiled on Sep  4 2004

when I try to start the postmaster using
   pg_ctl -D /usr/local/pgsql/data -l /var/log/pgsql/logfile start
it just exits straight away.  

with normal logging the log file is empty.  with debug5 i get the envion
dump followed by
DEBUG:  -----------------------------------------
DEBUG:  found "/usr/bin/postgres" using argv[0]
DEBUG:  invoking IpcMemoryCreate(size=17776640)

config file is default except for (log settings added today after trying
to start failed; this install is just a tempory test so fsync=false is
acceptable)
  tcpip_socket=true
  shared_buffers=2000
  fsync=false
  log_min_messages=debug5
  log_min_error_statement=debug5

initdb was run yesterday with --locale=C

if I run "postmaster -D /usr/local/pgsql/data" i get the same invoking
ipcmemorycreate followed by "Bad system call"

Any ideas?

klint.

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