Page not found and excerpt errors

http://members.tameyourlizardbrain.com

When I click "Categories - Emotional Integration Techniques" I'm assuming the theme is listing all posts with that category.

When I click the post title I get a page not found error. Why would this be?

Also, it only displays an excerpt and the "read more" link isn't visible. How could I show the whole post or get the title link to work?