Well, I've learned alot about .Net and MM.net in this effort and i guess that's was the intention. After some searching this is what I've determined. When running the Solution under straight debug the value of
System.AppDomain.ConfigurationFile is:
@"C:\Temp\LearningCSharp\mmApplication\bin\Debug\mmApplication.exe.config"

When I debug under Nunit though System.AppDomain.ConfigurationFile is:
@"C:\Temp\LearningCSharp\Order System Business Objects\bin\Debug\NUnitAddin.TestRunner.Server.exe.config"

So NUnit is altering the behavior of the application. I notice that the mmApplication.exe.config file exists - at what point is this placed in this folder? Would it be just a matter of making a copy of it with the other name? (which is what I'll try next).

Mike