Help All incoming calls "unknown"!

[Recif]

Hello,

My problem is that all the incoming calls are displayed as unknown, even if it is a contact calling me!... Where to change this please? The problem didn't exist a few days ago. I've Cyanogenmod 10 latest nighty installed.
thanks

 

[Recif]

Found it: this is a problem on my operator!

 

[Stuntman]

Was about to advise that you check with your carrier. It happened to me a while a go when my carrier inadvertantly removed that feature from my plan.