Recent Global Feed has packed up

Over time, this plugin seems to pack up and stop working. It is a simple easy plugin, but it's not easy to troubleshoot.

Right now when I visit the Feed URL, I see CSS, no feed data. Near the bottom, I see "<p>ERROR: This is not a valid feed.</p></body>". Any idea how to remedy this?

Also, can we have an easy way under tools maybe, to set the feed name?

Thanks,

Matt