1blogtheme help – top menu disappears

I am using the 1blogtheme and I love it, but I recently realized that when I click on any internal page or post, my main (top) menu disappears. The only time the full menu displays currently is on the main (index) page. I think this happened when I upgraded to 2.5. I’m wondering if I need a new theme, but I wanted to check here first.. I would really like to continue using this theme if I could get help on possibly finding out how to fix this, if there is a fix. The site in mention is http://www.karlyns.com (top menu)