if the database contain a terrain projection then there are two notes:
1: make sure bluemarble and a basemap (against to the terrain) are in imagery.
2: the terrain data must be built with "have a mask" option and the mask file ought to be
"gtopo30_4km-mask.tif" this file is available on google support.
change "gtopo30_4km-mask.tif" to a proper name in order to match your terrain file.
for example, the terrain name is xxx.tif and the mask file name ought to be xxx-mask.tif
the no.2 is a known bugs.
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