Powershell hangs when called from NAnt?

We are calling powershell from Nant to execute a deploy script.  The script
executes properly but it never returns after completion.  

I am calling this nant script from Bamboo but I have tried directly from the
command line and it hangs as well.  Any ideas?   Thanks in advance.



	<target name="deployazurepackage" depends="azurepackage" >
		<echo message="Deploy Azure app with powershell calling
deployOLHazure.ps1" />
		<exec failonerror="true"
program="C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"
workingdir="${build.dir}\build" verbose="true" > 
			<arg value="-noprofile" />
			<arg value="-nologo" />
			<arg value="-noninteractive" />
			<arg value="-command" />
			<arg value="${build.dir}\build\deployOLHazure.ps1" />
			<arg value="${Azure.package.dir}" /> 
			<arg value="${Azure.packageName}" /> 
			<arg value="${Azure.serviceConfig}" /> 
			<arg value="${Azure.serviceName}" /> 
			<arg value="${Azure.storageName}" />
		    <arg value=";exit $LASTEXITCODE" /> 			
		</exec>
	</target>

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