My self-hosted WordPress blogs, except one, are not showing up. I’m also having the same issue with my Posterous feeds. I made sure to ensure that all of the feeds that are not showing mirror the one that is working, and nothing. I installed another RSS widget, and I got the following error:
An error has occurred; the feed is probably down. Try again later
I have tried the Feedburner and original feeds for all of them. Still can’t get them to work.