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 this particular 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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