It appears to be random, however i'm working costantly on my site, so maybe when i change something it changes it's behaviour (sometimes it doesn't work at all).
I don't know how it works so for me it is difficult to say
Version 3.1, if you want me to i can make you superadmin
here it's working:
www.isardegna.com/Sardegna.html
In the rest f the site it share's the homepage
thank you in advance