Not visible text on cards

[snowtimeglass]

You might want to try this:

Cards are blank, but saved in database

Try updating android webview ( https://play.google.com/store/apps/details?id=com.google.android.webview&hl=de_DE) and restarting your phone.

By the way, I think that now you can simply download the latest version, 2.16.2, from the Play Store.