No tweets appearing

Just downloaded this into a pretty fresh WP installation, followed the instructions for setting up the Twitter app, used my web site as the callback, entered the consumer key and secret into the Settings page for the plugin…but I can’t get anything to display where I’ve put the widget. Not even the title.

There are no JS errors showing in the console, and there were no errors installing, activating, or configuring the plugin.

What should I check?

http://wordpress.org/extend/plugins/rapid-twitter-widget/