we’re seeing some indications that there are problems with the hub handling real-time new post notifications for Feedburner and Blogger feeds.

We can’t really tell if this is a wide-spread issue or rather more specific, but if your feed hasn’t posted via Twitterfeed for some hours (and should have done), try logging into Twitterfeed, and click “check now” next to the feed in the dashboard. This will force us to manually process the feed, and we will then continue to process it regularly until such a time that we start receiveing new post notifications from the hub again.

UPDATE: We’ve had confirmation now that there is indeed a fairly major issue with Blogger and Feedburner feeds, and the guys at Google are presently looking into it.

UPDATE: This issue has been resolved now, thanks to Roman from Google for the below update:
Turned out there was a configuration problem that started causing all RPC requests with >32kb response to fail after the last AppEngine release. It was fixed around 22:30 UTC yesterday and since then everything looks fine again.