Having the same bug others have mentioned with the text and audio spoken by characters not being visible, only leaving the questions and answers. A restart of the game doesn't fix it, nor does restarting game with current vocabularly. Only starting a new game fixes it. Also, menu options sometimes do not function after the dialogue problems start.
Is there any work being done with bug fixes? I haven't been able to get very far over three restarts, although the problem starts while talking to a different character each time. The dialogue gives random words to learn so it's not entirely repetitive, but still frustrating.
This is specifically happening with Japanese.
I can provide screenshots if wanted, or try in another language.