Well, here's an interesting bit of news in response to my plea for help
locally from a coworker who is a web developer.
Any clues on where to go to remove this offending bit of code as a test,
or reasons it should be there? Brandon: does this ring any bells?
brain[sic]
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...
I know of no clever IE debugging techniques.
In my experience, however, IE's crashes normally occur when loading
embedded objects like applets, Flash, SVG, fonts, etc, or when people do
some unorthodox trickery in CSS or scripting. So when troubleshooting
problems like this, my instinct is to dig through the source to see if
there's anything odd going on.
(Having validating markup and CSS helps this process.)
My first observation is that the page is written in XHTML, and IE
doesn't support XHTML[1]. This isn't normally a problem, necessarily,
if the page is delivered as text/html (as these pages are), because IE
will look at it and treat it as HTML "tag soup", and ignore the non-HTML
XHTML stuff as bad markup to work around.
However, the site is also emitting an <?xml ... ?> prolog at the start
of the page. This has traditionally caused problems with IE in my
experience, because IE isn't sure if it should look at it as a raw XML
document or HTML. This issue is compounded by the fact that the page
isn't well-formed XML at all. (There are HTML-style <BR> tags in there,
for example.)