This plugin provides a widget to display the feed of a given user's posts on identi.ca, Twitter, or any service that offers a Twitter-like API.
Earlier versions of the widget had a bug which would not correctly link up identi.ca profiles in the widget title. To fix this, simply set the widget to use a different network (i.e., Twitter), switch it back to identi.ca, and then save your changes.
Either you literally don't have enough statuses to fill the queue (i.e., a new account with the service), or you have deleted some. Twitter, and possibly other services, will include a deleted status post in the count (though it is not included in the data).