NCL - Strange 'Noise' with plots (Installation trouble?)

 Hello,

I am rather new to NCL, but learning eagerly. Additionally, my appologies
if this is a duplicate post -- I have had trouble with geting the email
size with attatchment down under the 100k limit.

I have been encountering a rather strange problem that seems to be related
to my installation of NCL.

The problem I have been having is a seemingly random region of 'noise'
amidst the plotted data. This occurs regardless of which forecast hour
(which file) I plot, or within a given file, which parameter I plot, though
the location and magnitude of the region of 'noise' varies. Illustrating
this I have attached a zip of a sample image of 500 hpa heights from a 1deg
GEFS mean grib forecast, along with the corresponding NCL script.

I fellow (and more experienced) NCL user running Linux ran this script on
his machine using a copy of the same grib file and had a perfect plot -- no
'noise'. Further, using, degrib, I exported some of the same files'
parameters to a shp file and examined them, finding the data to look good.
As such, I am reasonably convinced that the problem does not lie in the
grib file, or the script themselves (though I would happy to be proven
wrong).

Any thoughts or suggestions as to what I can check or more simply, how I
can fix this problem?

I am running NCL 4.2.0.a033 on a Windows XP machine under CYGWIN that was
current as of less than a month ago (cygwin.exe v 1.5.24-2).
Sincerely,

Jacob Klee

(See attached file: test_plot_bw.zip)

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