OWA : Unable to attach a file or send an email

Hello,

I have two different users: 
- The first is unable to send mail from the new version of OWA 
- The second can not attach a file 

I tried: 
- Their profiles on different PCs, the problem persists. 
- Their PCs with different profiles, no worries for other profiles. 

Passing Light version of OWA it works. 

Exchange version 2013 SP1 is installing. 

Could you please help me? 

Thank you very much