So I've been messing around with isosurfaces and I've been having a problem
with JMOL not correctly rendering isosurfaces as seen bellow.

http://imgur.com/q8uMv

It seems as though an improper distance is being used for one of the
hydrogens on the 5 member ring.  I'm not quiet certain where to start
debugging this one so I thought I'd bring this problem here.  I recreated
this bug on the stock version of JMOL as well using the attached mol2 file
and the following commands

load azulene.mol2
isosurface molecular translucent
dots

Cheers Andrew