Page Design not showing up

I just discovered that my page design is not showing up for all my pages. I did not do anything to the code, so I am not sure why this is happening. Since some pages are showing up and some are not, I assume there is nothing wrong with the page.php or sidebar.php file. Any thoughts on what the problem might be? Thanks.

Page Design Working:
http://www.dennisbaker.net/
http://www.dennisbaker.net/about/
http://www.dennisbaker.net/actor/
http://www.dennisbaker.net/actor/resume/
http://www.dennisbaker.net/actor/video/
http://www.dennisbaker.net/actor/photos/

Page Design Now Working:
http://www.dennisbaker.net/teaching-artist/
http://www.dennisbaker.net/teaching-artist/resume/
http://www.dennisbaker.net/teaching-artist/shakespeare/
http://www.dennisbaker.net/fight-director/
http://www.dennisbaker.net/coaching/