MapServer - Polar Area Being Excluded

Question

I am experiencing some unexpected results when trying to use MapServer to create images with a polar projection. I am using the standard BlueMarble tif as the base layer (in wgs84 GCS) and am trying to reproject image into WGS 84 / UPS North (WKID 32661). The polar region seems to be getting 'clipped' out of the image.

The attached image was created using the mapfile below along with the shp2img utility included with ms4w.

Can anyone explain whats going on here?

--Mapfile MAP

NAME BMNG
STATUS ON
SIZE 800 500
IMAGETYPE PNG
UNITS METERS
EXTENT -28567783.609 -28567757.697 32567757.697 32567783.609
IMAGECOLOR 255 255 255
CONFIG "PROJ_LIB" "C:/DevTools/ms4w/proj/nad"
PROJECTION
    "proj=stere"
    "lat_0=90"
    "lat_ts=90"
    "lon_0=0"
    "k=0.994"
    "x_0=2000000"
    "y_0=2000000"
    "ellps=WGS84"
    "datum=WGS84"
    "units=m"
    "no_defs"
END

LAYER
    NAME 'BMNG_UPSN'
    TYPE RASTER
    STATUS DEFAULT
    DATA 'D:\stuff\bmng\bluemarble.tif'
    PROJECTION
        "init=epsg:4326"
    END
END #LAYER

END #MAP