[otrs] Can't "Reply All" or "Reply"

Dear all, I'm the root user on an OTRS system, and I can't reply or reply-to-all to a ticket. Is there something that I should do for my user account to be able to reply back to tickets? I have both incoming and outgoing email accounts configured on the system, the incoming is working fine, as well as the outgoing (when creating a new outbound email ticket), and I'm using OTRS 3.0.6. Please, your help is very much appreciated. Best Regards, Muhammad El-Sergani.