[Plugin: Pages Posts] disabling the custom css

hi there,
i am currently using the Pages Post Plug-in to send posts under the “announcements” category to the homepage. However, when the plugin isn’t activated, the home page css works, the page title shows up as “home” and the current page text background of the menu bar is white, as it is on the other pages.
not sure why the pages post is disabling the custom css or how to edit it. also noticed it is affecting the gallery and minutes page as well.
website is here:
http://manhattanddcouncil.info/wordpress/
thanks so much,
rebecca

http://wordpress.org/extend/plugins/pages-posts/