I'm using Genesis framework. I have twp pages that are full-width content (no sidebars) and each have a custom class assigned to the page.
After installing the plugin, both of my full-width content pages displayed as two-column with no sidebar content. IOW: my 920px pages displayed as main content of 600px and 300px empty sidebar. Viewing source, I saw that neither the custom page class nor the class 'full-width-content' appeared in the body tag.
I uninstalled and reinstalled the plugin twice; when uninstalled the pages reverted to the correct rendering and view source showed the body class tags were restored.