This has been reported elsewhere, moderator insisted I start a new post. The site using the widget is http://abbotvillagepress.com, trying to display posts from http://wboomsma.com. When first installed, it listed the most recent posts... but that hasn't changed since even though I've added posts to wboomsma.com. I am using very few of the other Jetpack Widgets (Facebook Like, Blog subscriptions) as this is a relatively new site that I'm just starting. (In the other thread a suspicion was conflict with another plugin.)
I've tried removing it and adding it back, but it still displays the "old" post list.
Any suggestions welcome... it would be a great feature if it updated!