Default [Q] viber not working on 3g is there a fix?

Hi all I have a big problem...
I just went from Nexus 4 to note 2 and rooted immediately thank you all...
My problem is that viber works great using wifi but not on 3g... Everything was working great on Nexus 4... Is this a bug of note 2? I use Dr ketan's rom...
Oh when I check my phone's accounts I can see Viber but can't add it..
Any solution please? because it is very importand to me.
Thanks in advance...