AIRCIListener + flexUnitTasks.jar fails on Windows

When I try to run flexunit with the AIRCIListener I get:

BUILD FAILED
C:\...\build.xml:245: Error launching the test runner.

My Ant target looks like this:

<target name="test"
            depends="clean, init"
            description="Compile TestRunner.mxml as a SWF runnable by AD">

        <mxmlc file="${test.src.loc}/${test.application.name}"
            configname="air"
               output="${test.bin.loc}/${test.artifact.name}">

            <compiler.source-path path-element="${src.loc}"/>
            <compiler.source-path path-element="${test.src.loc}"/>

            <!-- The TestRunner needs the flexunit libraries in the build/libs folder -->
            <library-path dir="${build.libs.loc}"
                          append="true">
                <include name="*.swc"/>
            </library-path>

            <library-path dir="${libs.loc}"
                          append="true">
                <include name="*.swc"/>
            </library-path>

            <!-- Sets java.awt.headless=true so font compilation works in headless environments -->
            <compiler.verbose-stacktraces>true</compiler.verbose-stacktraces>
            <compiler.headless-server>true</compiler.headless-server>
        </mxmlc>

        <!-- Execute TestRunner.swf as FlexUnit tests and publish reports -->
        <flexunit player="air"
                  swf="${test.bin.loc}/${test.artifact.name}"
                  toDir="${report.loc}"
                  haltonfailure="false"
                  verbose="true"/>

        <!-- Generate readable JUnit-style reports -->
        <junitreport todir="${report.loc}">
            <fileset dir="${report.loc}">
                <include name="TEST-*.xml"/>
            </fileset>
            <report format="frames"
                    todir="${report.loc}/html"/>
        </junitreport>

    </target>

I am using RC2 downloaded here: http://github.com/flexunit/flexunit/downloads

When I try flexUnitTasks-4.1.0.jar which I got by checking out the sources from github I get:

BUILD FAILED
C:\...\build.xml:245: java.util.concurrent.ExecutionException: command [<testcase classname='com.myproject.desktop.model::DesktopModelTest' name='testSetServerUrl' time='0.000'  status='success'/>] not understood

I guess this is because the SWCs are RC2 and the jar is RC1.

When I try the RC1 SWCs with the RC1 flexUnitTasks.jar my runner hangs while executing async tests.

So none of the combinations worked for me. I got the RC1 running for a while but when I addded more tests I got this hanger which is not caused by failures in my tests because they run fine under Mac.

Any idea on this?

Thanks,

Sönke