Seams emminent when mosaicing DEMs

[Ryan Sherby]

I am trying to mosaic DEMS made from contours that have been converted to DXFs.  I have a rather large area to be gridded so it has to be done in chunks.  I am providing a 1500ft buffer of each chunk to be gridded then cut back before the final mosaic to rid the interpolation during the gridding process.  As soon as I colordrape the image with sunshading the seam appears.  it is usaually a 2 pixle wide seam.  The seam is radically different colors but not elevations?? This has been stumping me for weeks.    Please Help, ErMapper support never could present a solution, except grid everything at once.  Impossible.