Creating a separate issue from http://drupal.org/node/438558 because I'm not seeing any errors.

I uploaded the offline theme, modified the settings file, and went into maintenance mode.

When I tested the site with a browser that was not logged in, I got a default, unthemed maintenance message.

I have verified that the Offline theme template files were not being used to create the pages.

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escoles’s picture

escoles commented
Title: Doesn't display » Missing page.tpl.php file
Component: Miscellaneous » Code
Category: support » bug

The reason the theme failed is because the distribution does not include a page.tpl.php file.

If you create that file by copying one of the existing template pages and renaming it, the theme works as described.