Wasn't it J.F. Miller who wrote:
>Hi All,
>
>I'm trying to figure out why I'm getting gaps in this ios surface.  I have
>the following settings for this render:
>
>     max_gradient 7
>     accuracy .0001
>
>I have set max gradient as high as 100 and accuracy as small as 1e-8 which
>made for a very slow render of exactly what you see here.  I can post the
>code if necessary.
>
>Thanks,

I can't see anything that looks like conventional isosurface holes.
There are a few dark areas that look a bit like your transparent objects
might have exceeded your max_trace_level (not to be confused with
max_trace).

See if it looks any better with 

     global_settings {max_trace_level 10}

-- 
Mike Williams
Gentleman of Leisure

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