
I had edited the functions.php file to add a 'read-more' link to the end of post snippets instead of the [...] text. Inadvertently I had added a newline outside of the php closing tag at the end of the file. As this file is included when rendering RSS feeds it created a blank line before the opening RSS tag - and any whitespace before the opening tag renders the XML document invalid... doh. … [Read more...]
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