Why is the selected theme not displayed in the Dashboard layout?

Why is the selected theme not displayed in the Dashboard layout?

Ensure that the complete access rights are provided to: a. The 'style.css' file located under: Tomcat5.5\webapps\ROOT\styles\style.css b. The 'css' folder for theme change and 'images' folder for logo change. This is advanced configuration, please consult Support team before doing the changes.