I think I found a small glitches in your plugin:
WordPress version: 3.4.1–hu_HU
WordPress SEO version: 1.2.5
I did this: Open the "Titles & Metas" page, or Permalinks
I expected the plugin to do this: See the legend of options
Instead it did this: Many options' (checkboxes) legends are missing.
Note: I try to change the admin dashboard to the us_EN, but unfortunately didn't work. (I try with WP Native Dashboard, but on WP SEO did not change) I did not known this problem is exist in another language, or not.
I download and install the 1.2.3 version, this is works (in English) without any problem. The 1.2.4, and the latest 1.2.5 from the developers tab have the sam problem.