Why doesn't GeoRas work with GRID DTM?

Discussion created by jkzm57 on Sep 30, 2010
GeoRas will create the XScutlines3D feature with a TIN DTM created from a
10m NED GRID DTM but the feature is empty when created with the
GRID.  Cross section viewer gives this message "PlotCrossSectionWK:20003:
Conversion to 3D feature failed, check it's extent".  What am I missing?