Hello,
I've downloaded the latest version of Polylang with a fresh version of WordPress 3.8.1 and everything works fine on posts and pages. I'm using german and english with german as default language.
The problem appears when I try to add categories and tags in german. They are not displayed in the website and I noticed they don't have the add and tick icons on the listing as the english ones have.
The same happens with tags, they are not displayed in german.
Do you have any idea of what could be the problem?
If you need any other information, please let me know.
Thank you.