I'm not able to compute the sasurface of a water (H2O) molecule:

$ isosurface test sasurface 1.4
test created with cutoff=0.0; isosurface count: 0
$ show isosurface
$

After the above commands, I cannot see any surface drawn, and in fact
after issuing the "show isosurface" command, it's not possible any
more to rotate the molecule in the GUI. With other (larger) molecules
the above procedure works as expected.

Interestingly, if I create a "molecular" surface instead, still no
surface is drawn, the molecule can still be rotated and the console
output looks like this:

$ isosurface test molecular
test created with cutoff=0.0; isosurface count: 1
$ show isosurface
<?xml version="1.0"?>
<jvxl version="2.2" jmolVersion="Jmol 12.3.32_dev  2012-06-20 18:17"
xmlns="http://jmol.org/jvxl_schema";
xmlns:cml="http://www.xml-cml.org/schema";>
...
</jvxlEdgeData>
<jvxlInvalidatedVertexData bsEncoding="base90+35" count="736"
len="736"> -#}3+ </jvxlInvalidatedVertexData>
</jvxlSurfaceData>
</jvxlSurface>
</jvxlSurfaceSet>
</jvxl>

I encountered the above behaviour on a very recent jmol codebase
checked out from svn (jmol revision 17324) with Java 7u[4-5] on Mac OS
X and Fedora Linux.

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