Description:
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Have tried this in IE6 and IE7 - same problem happens, but doesn't happen in Firefox.  Basically, the script won't let you view source on a dynamically generated XML document if the script starts a session.  This in itself is not so bad, but it also makes Flex think it hasn't loaded a proper XML document, which is a much bigger problem for us.

The only thing different with this build of PHP from the default is the inclusion of the MySQL and GD2 libraries, we have added a path for the log, and the magic_quotes directive has been modified back and forth.

Hope this helps,

Reproduce code:
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<?php
session_start();  //comment this line out and it works.
echo "<?xml version=\"1.0\" encoding=\"ISO-8859-1\" ?>\n";
echo "<root>\n";
echo "\t<item>value</item>\n";
echo "</root>";
?>

Expected result:
----------------
You should see a short XML document displayed (which you will), but when you right click and view source it should let you actually see the source code (which it won't).

Actual result:
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instead of showing source it prompts with a messagebox reading "The XML source file is unavailable for viewing".  The source is not displayed.