VisBuildCmd doesn't exit when called from CruiseControl.NET

[dmurty]

Hello, we are using CCNET version 1.4.4.83 and Visual Build Pro 7.2. We have csservice.exe running as a service and we have the following task:
<exec>
<executable>"C:\Program Files\VisBuildPro\VisBuildPro.exe"</executable>
<baseDirectory>D:\Install</baseDirectory>
<buildArgs>/b "DeveloperCompile.bld"</buildArgs>
<successExitCodes>0</successExitCodes>
<buildTimeoutSeconds>3600</buildTimeoutSeconds>
</exec>

Visual Build Completes successfully, according to the log files, but visbuildcmd never exits and there fore the ccnet task times out and fails the build.

What can we do to resolve this issue?

Thanks