Problem with broken OpenPublish theme on fresh install

Hi all, having a bit of a problem with a new install of OpenPublish 2.1. This is a new install, not an update. Address is mns.jschool.umd.edu.

As best I can tell, I did everything correctly on the install, following the directions on both Drupal.org and OpenPublishApp.com. I installed it on a server running Microsoft IIS (no Apache, unfortunately). Running PHP 5.2.10. Running MySQL 5.1.35. As suggested here, I jacked up the memory_limit variable to 220M. I set the max_execution_time to 300, set realpath_cache_size to 2M, and changed the max_input_time to 120.

Where I am now: I got the install script to run, and I can access the admin pages without problem. The problem appears when I try to create content, I get this error (among others).

"PHP Fatal error: Call to undefined function openpublish_addthis_widget() in E:\WebSites2\mns.umd.edu\sites\all\themes\openpublish_theme 2\page\page.tpl.php on line 96"

Also, the main index page just looks wrong, as though the stylesheet is missing or something. It's completely bare bones. Here's a screenshot, in case I have a different theme up when you access the site: http://mns.jschool.umd.edu/openpubscreenshot.tiff.

I discovered that if I change the theme from OpenPublish to any of the other pre-installed themes, it seems to work fine. I can create content and it appears without issue. The issue appears to be with the Open Publish theme itself.

I tried updating with the new version of the theme (6.x-1.15, released July 28), but get the same issue.

BTW, just as a test, I also did a test install of the latest stable Drupal build, 6.17, and it worked fine. So it seems like the issue I'm having is native to OpenPublish (and specifically, something with the theme).

Anyone run across this before? Any suggestions? Unfortunately, what really attracts me to using OpenPublish is the default theme -- and it's the only thing I can't get to work. I will be eternally grateful for help!

Sean