Multi-threaded Nlog outputing Info on my local laptop but not on my Server?

[Ed Landau]

Hello:

I have a multi-threaded C# application, developed with Visual Studio 2013, based on .Net 4.5.

I got NLog using Nuget.  I currently have the following installed: NLog,Version 4.2.0.

my NLog Config file looks like this: 

  <target name="asyncWrapper" xsi:Type="AsyncWrapper" queueLimit="20000">

            <target name="LogFile"

                xsi:type="File"

                fileName="C:\QRT\Logs\QRTLog-${shortdate}.log"

                layout="${date:format=yyyy-MM-dd HH\:mm\:ss.fff}|${level}|${threadid}|${threadname}|${event-properties:item=FromID}|${message}${exception:format=tostring} "

                concurrentWrites="true" />

   </target>

  <rules>

    <logger name="*" minlevel="Debug" writeTo="ColoredConsole" />

    <logger name="*" minlevel="Debug" writeTo="LogFile" />

  </rules>

At the start of my program, I log a Trace, Debug, Info, Warn, Error, and Fatal message.

Running on my local Windows 7 machine, which has .NET 4.5.2, I see all these on the Console and in the logfile.

Running the same executable on a Windows 2008 Server, I see all these on the Console BUT NOT IN THE LOG FILE.

I enabled NLog internal trace and there are no errors.

Any help / pointers would be greatly appreciated.  I've been trying to debug thisfor over a month now and am about to give up and implement my own logging routine manually (which I did and it works by the way... but it it simple streamwriter).  

Thanks

-Ed