subversion 1.4.0 svn checkout crash

Hi,
I just upgraded to 1.4.0 and now I have a crash when I try to checkout my
working copy. the "crash" means standard windows error pop-up and working
copy remains locked.
It consistently happens in the middle of the checkout.
The scenario is very simple - checkout fresh copy via http [svn checkout "
http://myserver/svn/trunk" "S:\working-copy"]
S is a subst drive.
The server is continuous integration server and svn command is executed as a
part of the build script, as an "execute" ant task.

NOTE: I can *NOT* reproduce this crash when running the same command from
the command line window.

NOTE: It was perfectly working with 1.3.2 for ~ 1 year.

This is the exactly ant task I use:

    <target name="test-svn-checkout">
        <exec executable="svn.exe" failonerror="true">
            <arg value="checkout"/>
            <arg value="--non-interactive"/>
            <arg value="--username"/>
            <arg value="DOMAIN\user"/>
            <arg value="--password"/>
            <arg value="password"/>
            <arg value="http://example/repo"/>
            <arg value="S:\working copy"/>
        </exec>
    </target>

my server env:
Intel Xeon CPU 3.00 GHz 1.00 GB of RAM
Microsoft Windows Server 2003 Standard Edition Service Pack 1
Apache 2.0.54
svn, version 1.4.0 (r21228) compiled Sep 11 2006, 17:46:59 [installed from
the svn-1.4.0-setup.exe]

my client env:
Intel Xeon CPU2.80 GHz 1.00 GB of RAM
Microsoft Windows Server 2003 Standard Edition Service Pack 1
svn, version 1.4.0 (r21228) compiled Sep 11 2006, 17:46:59 [installed from
the svn-1.4.0-setup.exe]
ant 1.6.2

-- 
Best Regards,
Moisei