Here is a similar set of responses for an image which gets overwritten:

1st request:

[1] request for intranet/img/bar.features.png:
<<< GET /img/bar.features.png HTTP/1.1
<<< Connection: Keep-Alive
<<< Host: intranet
<<< User-Agent: HTTrack/3.0x
<<< Accept: image/png, image/jpeg, image/pjpeg, image/x-xbitmap,
image/svg+xml, image/gif;q=0.9, */*;q=0.1
<<< Accept-Language: en, en, *
<<< Accept-Charset: iso-8859-1, iso-8859-*;q=0.9, utf-8;q=0.66, *;q=0.33
<<< Accept-Encoding: gzip, identity;q=0.9


[1] response for intranet/img/bar.features.png:
code=200
>>> HTTP/1.1 200 OK
>>> Date: Wed, 11 Mar 2009 23:47:51 GMT
>>> Server: Apache/2.0.58 (Unix) PHP/5.1.2
>>> Last-Modified: Wed, 11 Mar 2009 13:52:28 GMT
>>> ETag: "48c035-3e8-2d9fbf00"
>>> Accept-Ranges: bytes
>>> Content-Length: 1000
>>> Keep-Alive: timeout=15, max=86
>>> Connection: Keep-Alive
>>> Content-Type: image/png


And the 2nd request:

[58] request for intranet/img/bar.features.png:
<<< GET /img/bar.features.png HTTP/1.1
<<< If-Unmodified-Since: Wed, 11 Mar 2009 13:52:28 GMT
<<< Range: bytes=1000-
<<< Referer: <http://intranet/>
<<< Connection: Keep-Alive
<<< Host: intranet
<<< User-Agent: HTTrack/3.0x
<<< Accept: image/png, image/jpeg, image/pjpeg, image/x-xbitmap,
image/svg+xml, image/gif;q=0.9, */*;q=0.1
<<< Accept-Language: en, en, *
<<< Accept-Charset: iso-8859-1, iso-8859-*;q=0.9, utf-8;q=0.66, *;q=0.33
<<< Accept-Encoding: gzip, identity;q=0.9


[58] response for intranet/img/bar.features.png:
code=416
>>> HTTP/1.1 416 Requested Range Not Satisfiable
>>> Date: Thu, 12 Mar 2009 00:18:40 GMT
>>> Server: Apache/2.0.58 (Unix) PHP/5.1.2
>>> Vary: Accept-Encoding
>>> Content-Encoding: gzip
>>> Keep-Alive: timeout=15, max=100
>>> Connection: Keep-Alive
>>> Transfer-Encoding: chunked
>>> Content-Type: text/html; charset=iso-8859-1


Is this some kind of misconfiguration with our intranet server?
Regards,
Brian