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Strange "stair step" in fgdbr DEM in 9.3.1

Question asked by mikedmanak on May 25, 2011
I've got a large (20gb) DEM mosaic'd from geotiff tiles into an 10 file geodatabase.  The raster appears to function just fine when used with 3D analyst to cut cross sections (see image #1). 

However, our users need to use the raster in 9.3.1 with HEC GeoRAS.  I moved the raster to a 9.3.1 file geodatabase, but when they cut cross sections with 3D analyst in 9.3.1 they get a strange "stair stepped" result (see image #2)

Any ideas?  The 9.3.1 data works just fine in ArcGIS 10...

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