There is a bug in the Chumby RSS reader: if there is only one item in the channel, then the RSS reader will not behave well.

Here is a minimal test case:

<?xml version="1.0" ?>
<rss version="2.0">
<channel>
    <title>Test Feed </title>

    <link>http://127.0.0.1/rss/</link>

    <description>This is a test RSS feed</description>
    <language>en-us</language>

    <item>
        <title>One</title>
        <link>http://127.0.0.1/rss/1</link>
        <description>ONE</description>
    </item>

</channel>
</rss>

The Chumby RSS reader will say:
No articles found.
RSS Format may be unsupported.

To make it work, add another item to the channel, like:

    <item>
        <title>Two</title>
        <link>http://127.0.0.1/rss/2</link>
        <description>TWO</description>
    </item>

One more thing:  it shouldn't be considered an error if there were no items.