[Plugin: Tweet Blender] Tweets not current

I have tweet blender installed at contencurrents.com. I’m running WP 3.01 and Tweet Blender 3.1.10. When I go to my site, the most recent tweets don’t appear – the site typically shows all but the most recent 2 or 3 tweets. When I click the “Refresh Tweets” button, the current tweets appear. Thanks.