It seems to work fine for me in IE10... I'm not sure what's going on there. Also, it is possible to view the feed for a single source: clicking on a feed label

It seems to work fine for me in IE10... I'm not sure what's going on there. Also, it is possible to view the feed for a single source: clicking on a feed label in the subscriptions list shows just the items from that feed. If you have folders (like there are on the "try" page), clicking on the folder label shows items from all feeds inside the folder, but clicking on the folder icon expands the folder.