My TwitterFeed isn't updating...

My TwitterFeed isn't updating....

I've just added two feeds to TwitterFeed on Friday. Both worked fine initially - they tweeted when a new item was added to each feed. But now one of them, my blog feed, is not tweeting the existence of a new item even though the RSS feed has been updated. The TwitterFeed page reports everything is OK and that the last item was published on Friday - but the last item was published on Saturday.

Things I've checked:

- Hourly update is on
- I've verified the feed URL (http://feeds.feedburner.com/ianhockin...) is valid XML; I've swapped that FeedBurner feed with the original feed (http://ianhocking.com/?feed=rss2) in case FeedBurner was the problem, but that still hasn't helped - the new feed is also valid XML
- The feed is public, requires no password
- The feed gets picked up fine by Google Reader and NetNewsFire

Any ideas?

Best
Ian