Dialogue text not showing up
You can try a -repair of the client. Instructions found in the Knowledge Base accessed via the ‘Support’ link above/below and ‘Search – Repair’.
You can contact the Tech CS Team via the same link and ‘Submit a Ticket’ for assistance.
(You can also request a change to your Display Name when you contact the CS Team. Do be aware, it can have consequences with regards to Mail, Friends List, etc.)
Good luck.