I sincerely hope I'm not hijacking this thread since I'm having a similar issue with my backend Admin area. I, too, am using the most current version of WP. When logged in the lower half of the backend setting templates are off. I've disabled all plugins and re-enabled each, one at a time, and observed that this is the only plugin causing the issue. I'm using the theme Esplanade; however, I've tested with Twenty Ten and Twenty Eleven and encountered the exact same issues (minus one). Here are the issues I'm observing:
1) When clicking on settings/discussion in the Admin area and scrolling to the bottom the page I notice that the avatars appear to be stepped. They are displayed across the screen from left to right.
2) Appearance/themes/and theme options for Esplanade theme. There is a design tab that when pressed allows me to choose the color scheme. The top portion of this page displays wonky.
3) When accessing the setting section of Google XML Sitemaps, the lower portion of the page starts overlapping this is causing some settings to not display properly or allows them to hidden by section spacers.
I've tried to be as clear as possible in my descriptions but if additional info is needed please ask and I will try to supply. Plus, as I stated earlier, I have these issues even when using the "default" themes.