Google reader "shared items" feeds don't show up in EventBox!

Me and some friends use Google reader and its "share" feature. For various reasons, I want to have a regular folder in Google reader that contains all items that are shared between us. Luckily, Google reader automatically generates an atom feed of each person's public shared (and annotated) items. Simply subscribing to these feeds and putting them together into a folder works quite nicely on most clients (e.g. Byline on iPhone), doing exactly what we want.

It does not, however, work in EventBox. At all. In Google reader (within EventBox), the folder containing the feeds is displayed, but shown as empty (no matter how many feeds and unread posts there really are). If I add the feeds using the regular "Feeds" feature instead, their previews and their respective unread counts are displayed correctly, but trying to read them from within EventBox still results in a blank, white page.

Like I said, those feeds work correctly in all other clients I tested them in. So why is EventBox not able to handle them correctly? (After all, they're the "official" feeds generated by Google itself)