Some more information, I debugged this some more and noticed that the attachedtemplate property is set to the "Normal" template file. For some reason when it is loaded from a network share, this value isn't being retained or it can't find the template file even though it is in the same location. Anyone know why that would be? If I update the value in code to point to the correct template file at that share location, the mail merge works fine but it can't seem to resolve it on its own.