Bug report to the Internet Explorer development team: I have a few subscribed feeds (such as my own Live Spaces feed http://sdolha.spaces.live.com/feed.rss) within Internet Explorer favorites (imported from Internet Explorer 7). When I open the feeds in Internet Explorer 7 they are open and displayed correctly. But when I try to open SOME of them (including Live Spaces feeds, and MSDN feeds) in Internet Explorer 8 Beta 2, an error message is shown (“This feed contains errors. Internet Explorer will try updating this feed again later.”) and the loaded feed is only partially displayed (the latest posts are not included).
Update: After deleting each error generating feed from the subscribed feeds list (from the Favorites), and re-adding it (by re-subscribing to it), they are loaded and displayed correctly. It’s possible that this was not an issue of Internet Explorer 8 Beta 2 itself, but an upgrading setup issue (from Internet Explorer 7 to Internet Explorer 8 Beta 2). Anyway, problem is completely resolved this way (described above).