JA Sensei version 4.6.7 is now available on Google Play. This version brings much improvement on the vocabulary quiz following the messages you sent me. Here are the new features:

• Vocabulary: during quizzes, possibility to display several Japanese writings and to get audio support
• Aural comprehension: added possibility to unlock the script without validating the quiz
• Kana: fixed inadequate grid for compound kana during writing quizzes
• Improved the integration of one's profile's picture (didn't work on some devices anymore)
• Fixed the German interface mistakes (thanks a lot Florian!)
• Fixed sluggish vertical scroll on some pages (grammar, particles, etc.)
• Fixed: some users with Android 4 couldn't connect to their account anymore

Please leave a comment on Google Play to let me know what you think of JA Sensei and to encourage me to develop more features.