here is the problem: after i've updated the plugin to v. 1.1 i can't read any written post in edit mode (they appear completely white in writeable area) and under the edit area itself i get only the WordPress Seo rectangle and no other options.
I'm using an italian version of WordPress and WordPress Seo automatically update its localization to italian.
If I disable the plugin, all the edit area for every articles come normal again, luckily.
Thanks for any help! :)