All in One SEO Pack – Description, keywords not displaying

I’m using the All-in-One SEO pack for the first time and I can’t get the meta keywords or description to display. I originally had the same problem with the title tag, and I had to add a blank

<title></title>  

tag to my header.php to get the title tag to display. Do I need blank placeholders for the keywords and descriptions as well? I’ve tried adding

 <meta name="description" content="">  <meta name="keywords" content=""> 

but this didn’t work. I can’t find anything in the documentation, which implies it will just work. What am I doing wrong?