Problem displaying Pages and Posts together

Hello,
I have a blog (http://blog.italianvirtualschool.it) but if I activate Polylang (as i would) the pages contents are displayed together with the posts contents.
Now the plugin is disabled so you cannot see this.
I also try to uninstall and install again the plugin without success.

My wordpress version is 3.6 and of course I’m not using a stating front page.

Thank you,
Silvia

http://wordpress.org/plugins/polylang/