no way to connect to new wi-fi nets

[antonio.montagnani at alice.it]

after latest updates  I suddenly realized that I cannot connetc to any new net 
that is found in the nearby.

This night I went for the first time to a 
friend's home,I got a list of more tha 30 nets, but I didn't succed to connect 
to any of them: old nets (that were already connected in the past) are working 
fine.

Is anybody else experiencing this trouble.

Tnx

Antonio