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The issue popped again as I initially reported here: issue #15320 Stack Overflow - Other

Consequence was that Thunderbird was unable to load the feed, until the invalid characters slid out of the RSS.

The error that popped on this feed because of this post is now gone but here is the error reported by the W3C validator:

Sorry This feed does not validate.
line 206, column 1357: XML parsing error: <unknown>:206:1357: reference to invalid character number [help]

    ... /p&gt;&#xA;&lt;pre&gt;&lt;code&gt;&#xA0;&#x13; &#xA;&lt;/code&gt;&lt;/pr ...
                                                 ^

If you run the W3C validator today, it sill reports an issue with the namespace:

This feed is valid, but interoperability with the widest range of feed readers could be improved by implementing the following recommendations.
line 2, column 0: Use of unknown namespace: http://purl.org/atompub/rank/1.0 [help]

    <feed xmlns="http://www.w3.org/2005/Atom" xmlns:creativeCommons="http://backend.userland.com/creativeCommonsRssModule" xmlns:re="http://purl.org/atompub/rank/1.0">

Post that caused the invalid characters in the RSS feed:


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