Content Encoding Error

When I go to this URL:

/mantis/manage_custom_field_edit_page.php?field_id=1

I get this error in Firefox and IE:

Content Encoding Error

The page you are trying to view cannot be shown because it uses an invalid
or unsupported form of compression.
  *   Please contact the website owners to inform them of this problem.

I never seen this error during testing.  I moved the code from a WinXP
test box to a Win 2003 server.

Anyone know anything about this?

Here are the headers being sent.  Everything looks fine.  Also, this is
the only page that I have seen this on.


GET /mantis/manage_custom_field_edit_page.php?field_id=1 HTTP/1.1
Host: standrews
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1b4)
Gecko/20090423 Firefox/3.5b4 (.NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Referer: http://standrews/mantis/manage_custom_field_page.php
Cookie: MANTIS_VIEW_SETTINGS=231; PHPSESSID=XXX; MANTIS_STRING_COOKIE=XXX

HTTP/1.x 200 OK
Connection: close
Date: Thu, 07 May 2009 15:51:02 GMT
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET, PHP/5.2.9-2
Pragma: no-cache
Cache-Control: no-store, no-cache, must-revalidate
Expires: Thu, 07 May 2009 15:51:02 GMT
Last-Modified: Thu, 07 May 2009 15:51:02 GMT
Content-Type: text/html;charset=utf-8
Content-Encoding: gzip
Vary: Accept-Encoding

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