When transforming a world map in a geodetic system (such as WGS84) to a predefined projection (such as Robinson) using MAPublisher, the central meridian of the predefined projection should be set to 0 degree longitude as shown below.
Image 1: world map in WGS84
Image 2: world map in a predefined Robinson Projection
After importing a DEM file, you can always check the elevation value of a specific pixel in the Georeference dialog window. When you hover your mouse over the DEM image in the preview windw, you can get the image XY coordinate, latitude and longitude values, eastings and northing values (if the map is projected), as well as the elevation value.