Thanks for writing in!
As you mentioned your site license is not getting validated, we would like you to please follow this instruction to validate it.
Please let us know if that doesn't help. After validating your site please update your theme and cornerstone to latest version. In latest version lots of issue has been taken care.
If after update the issue presets please give us your website details so that we can have a look.
Please provide following information:
Set it as Secure Note
* Link to your site
* WordPress Admin username / password
* FTP credentials
All the best!