What theme switching plugin are you using?
I’m using Ryan Boren’s Theme Switcher just fine on http://dev.d10e.net/wordpress/
I am using it on several sites. Upgrade to the latest version of WP and we’ll see if we can’t troubleshoot it for you.
I was using the theme switching plugin for 1.5. I am running the most current, as far as I know.
Assuming you’ve activated the plugin…
Could you paste the contents of your sidebar.php at http://pastebin.com/ and then report the pastebin link back here.
<meta name=”generator” content=”WordPress 1.5.1.3″ />
Current version is 1.5.2. Not sure why MH wants to see the sidebar. Once activated again let us know so we can see what is displayed and try the links for ourselves. We’ll be able to post back with our results and perhaps some ideas. In the meantime, be sure and do a thorough search of the forum because this has come up a number of times and I don’t remember how they were resolved. Since I use Ryan’s plugin, that would be my choice of plugin to be activated.
Beel–I was under impression that code needed to be inserted into sidebar.php, at least for:
http://dev.wp-plugins.org/wiki/ThemeSwitcher