http://www.jammersreviews.com/info/rss.xml
I came across this new feed, and for some reason it's not being recognized by OW. (I double-checked, and it works perfectly fine in Safari.) In fact, now that I look at it, ALL of the feeds are broken, on every site I've tried to check so far — for trying to add a new feed, that is. OW just treats it as text or HTML.
Fortunately, old feeds still seem to work.