problem with permalinks and theme switcher

I just installed v1.5 and picked out a few themes and installed the theme switcher plug in from here http://dev.wp-plugins.org/wiki/ThemeSwitcher . It works as advertised except for one thing. When I link to a permalink page, eg. archives, the theme is not the one on the main page. In other words the theme on linked pages isn’t changing with the theme on the front page. I think this link is related, http://wordpress.org/support/topic.php?id=16693#post-95964 and I tried adding this:
<style type="text/css" media="screen">
@import url( <?php bloginfo('stylesheet_url'); ?> );
</style>
to all of the themes header.php page.

I would really appreciate any and all help as banging my head against the wall doesn’t seem to help……