Description:
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The English and French manuals both show the following error BUT only if you're NOT logged in:

<br />
<b>Warning</b>:  session_start(): The session id contains invalid characters, valid characters are only a-z, A-Z and 0-9 in <b>/usr/local/www/pearweb/include/pear-prepend.php</b> on line <b>98</b><br />

Now, because the page has a <?xml ?> tag in it, IE will always try to read it as XML regardless of the text/html content type or not, thus:

The XML page cannot be displayed 
Cannot view XML input using XSL style sheet. Please correct the error and then click the Refresh button, or try again later. 


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Only one top level element is allowed in an XML document. Error processing resource 'http://pear.php.net/manual/en/'. Line...

<b>Warning</b>:  session_start(): The session id contains invalid characters, valid characters are only a-z, A-Z...

The error itself doesn't seem to have a reason, its a simple session_start() and I see nothing setting an alternate session_id... 

- Davey