Segmentation Fault on XP (Signal 11)

I'm trying to create a user on a postgreSQL 7.4.1 installation on the cygwin
platform. My OS is XP pro SP2. I keep getting a "Segmentation fault (core
dumped)" message from the command line (it shows up as a "Signal 11" error
when run from a shell script).

$ createuser -d -P -A dcts
Enter password for new user:
Enter it again:
Segmentation fault (core dumped)

The psql and createdb commands produce the same error for me. I have
installed the exact same version of cygwin on windows 2000 professional, and
these commands work fine.

I've tried disabling my firewall, uninstalling my McAfee virus software, the
LSP fix utility, uninstalling SP2, building the database from source, and
installing the win32 ports for 7.5 and 8.0 beta. None of these actions made
a difference. Is there a known issue with postgres on XP pro SP2? Has
anyone gotten this working and can provide any info on similar issues
encountered?

Thanks,

Matt