[GRASSLIST:2296] s.surf.rst generating seemingly empty rasters

[Matthew Tennant]

This occurs on the Windows port of GRASS (5.0.2) using the cygwin 
environment and XWindows driver

No matter what I try, it seems that when I use s.surf.rst to produce a 
raster file from my sites file (hg1), I produce trashed rasters that for 
example have a size of 0 bytes in the cell directory in the mapset.
I tried using g.region sites=hg1 to change the region but to no avail.
The actual s.surf.rst process works OK, discarding only 4 of my points, 
including the rest, and taking some time to complete because of the 
relatively high resolution.
If I then try to display the raster I've created I get the error message
Warning: Fail of initial read of compressed file [hg1 in PERMANENT]
Warning: unable to open raster map [hg1 in PERMANENT]
Error: Not able to open cellfile for [hg1]

Could it be because I have null values in the site file?

Region:-

proj:       3
zone:       0
north:      90N
south:      89:55:12S
east:       153:02:24W
west:       121:55:12W
cols:       448
rows:       245
e-w resol:  0:44:02.785714
n-s resol:  0:44:03.722449

Site file (hg1)

name|
desc|
time|
labels|
form|
-3.45|53.5|%0.8265  @"x"
-0.09|52.5|%0.655  @"x"
5.45|53.1|%0.55323 @"x"
10.8|59.9|%0.2651  @"x"
18.1|59.3|%0.1887  @"x"
-21.9|64.2|%0.4144  @"x"
23.7|38|%0.1724           @"x"
20.3|67.9|%0.0857  @"xi"
25|60.2|%0.0404  @"x"
21.6|53.9|%0.0402   @"x"
77.2|28.6|%0.1707   @"x"
77.4|23.3|%0.125   @"x"
106.9|47.9|%0.064   @"x"
25.0|60.2|%0.0404   @"x"
27.6|53.9|%0.0402   @"x"
77.2|28.6|%0.1707   @"x"
77.4|23.3|%0.125    @"x"
106.9|47.9|%0.064   @"x"
33.4|35.3|%0.0816   @"x"
35.0|32.8|%0.3556   @"x"
39.9|24.6|%0.1531   @"x"
39.9|21.5|%0.1029   @"x"
29.0|41.0|%0.1844   @"x"
34.5|31.5|%0.0839   @"x"
36.3|33.5|%0.0972   @"x"
44.8|41.7|%0.1038   @"x"
43.8|40.8|%0.4               @"x"
43.3|38.5|%0.1684   @"x"
44.3|39.8|%0.2273   @"x"
44.5|40.2|%0.2222   @"x"
44.5|40.8|%0.2222   @"x"
32.7|41.2|%0.4279   @"x"
37.3|36.2|%0.0943   @"x"
51.5|35.7|%0.3214   @"x"
71.7|41.0|%0.2857    @"x"
34.0|18.0|%0.0                @"x"
44.0|15.0|%0.0484   @"x"
40.0|40.3|%0.075    @"x"
26.0|-24.8|%0.0     @"x"
40.0|8.0|%0.0                @"x"