initdb fails with invalid argument to shmat

I am using Cygwin 1.5.10-3 and postgresql 7.4.3-1 freshly downloaded and installed from scratch earlier today.

I have set CYGWIN=server and started cygserver (from the default account).

I receive the following when I execute "initdb -D /home/default/data --debug". Can someone set me straight? I don't see
thisparticular problem in the archives. Thanks. 

================

Running in debug mode.

initdb: internal variables:
  PGDATA=/home/default/data
  datadir=/usr/share/postgresql
  PGPATH=/usr/bin
  ENCODING=
  ENCODINGID=0
  POSTGRES_SUPERUSERNAME=default
  POSTGRES_BKI=/usr/share/postgresql/postgres.bki
  POSTGRES_DESCR=/usr/share/postgresql/postgres.description
  POSTGRESQL_CONF_SAMPLE=/usr/share/postgresql/postgresql.conf.sample
  PG_HBA_SAMPLE=/usr/share/postgresql/pg_hba.conf.sample
  PG_IDENT_SAMPLE=/usr/share/postgresql/pg_ident.conf.sample
The files belonging to this database system will be owned by user "default".
This user must also own the server process.

The database cluster will be initialized with locale C.

creating directory /home/default/data... ok
creating directory /home/default/data/base... ok
creating directory /home/default/data/global... ok
creating directory /home/default/data/pg_xlog... ok
creating directory /home/default/data/pg_clog... ok
selecting default max_connections... 10
selecting default shared_buffers... 50
creating configuration files... ok
creating template1 database in /home/default/data/base/1... DEBUG:  invoking IpcMemoryCreate(size=1081344)
FATAL:  shmat(id=983040) failed: Invalid argument
DEBUG:  proc_exit(1)
DEBUG:  shmem_exit(1)
DEBUG:  exit(1)


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