Encoding Problem

Hi.
You should to change DB encoding to UTF-8 – by default developers made it in latin encoding.
Open your WP db in e.g. phpMyAdmin, locate wp_pbci_mail_control and wp_pbci_mail_queue tables, change their encoding to UTF-8, then navigate to table structure (both of them), find all rows with latin encoding, and change them to UTF-8 too.

Or make it as described here:
https://stackoverflow.com/questions/8906813/how-to-change-the-default-charset-of-a-mysql-table