DNRGPS 6.0.0.15 was released recently. This version fixes a couple of major bugs. See the release notes for details.

Tip: this software does not, at present, handle the Michigan GeoRef projection properly. I have filed a bug report to the developers, but saving files in either unprojected lat/lon or UTM and converting in ArcGIS to Michigan GeoRef is the best solution until this problem is fixed.