What happened to the notification light?

Try installing Light Flow and see if you get notifications. Despite sounding like a type of tampon, it's an excellent notification light tool.
 
Un check, restart and check again no work.

Wen i missing a call the light not emit light

Sent from my Galaxy Nexus
 
My light only work for text messages and mails incoming

This is normal? I don't remember if in the past emit light for lost call...

Sent from my Galaxy Nexus
 
I am also having the same problem. My light is constantly blinking light blue and I cannot shut it off. Started after JB OTA update. Plus horrible signal, dropped calls, and my wall paper disappeared! Thinking of returning to stock and starting over.