To partially answer my own question, for some strange reason when I manually enter a feed URL like this:
//localhost/zen-cart/index.php?main_page=rss_feed&feed=categories&cPath=65
..the feed works with the & written as & and this is how the feed link is written in the source of the page. However, when you click on the links to the feeds on the page, the URL isn't escaped...
//localhost/zen-cart/index.php?main_page=rss_feed&feed=categories&cPath=65
And that "normal" link doesn't work.. just a blank page.
This is on IE7. Quite baffled.
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