Recovering after natgrid failure

Howdy PyNGL'rs!

So, I've got a fancy program that loops over times to grid out data for
each time. The problem is that when natgrid hits a failure, the next call
results in a segfault. Here is a simple reproducer:

import Ngl
import numpy

vals = [278.14, 280.87, 280.87]
lats = [31.39, 33.21, 33.57]
lons = [-92.29, -87.62, -86.75]

XAXIS = numpy.arange(-92., -88.25, 0.25)
YAXIS = numpy.arange(30.,25., 0.25)

grid = Ngl.natgrid(lons, lats, vals, XAXIS, YAXIS)
grid = Ngl.natgrid(lons, lats, vals, XAXIS, YAXIS)

---------
Running in gdb yields:

Program received signal SIGSEGV, Segmentation fault.
0x00002ac7557be22f in FreeMatrixd ()
    from /home/mesonet/python-2.5/lib/python2.5/site-packages/PyNGL/_hlu.so

I ran a simple/similiar test with NCL and get the same segfault.

thanks!
   daryl

-- 
/**
  * Daryl Herzmann
  * Assistant Scientist -- Iowa Environmental Mesonet
  * http://mesonet.agron.iastate.edu
  */
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