I also have blank notes in iOS with EN 8.0.3! I searched for the exact cause and narrowed it down to the use of specially formatted content. In my case it is google sheets tables that I copied and pasted over to EN. The desktop and web clients display the notes without any issue. I even remember having seen notes with google sheets tables on iOS last week, just before the update to 8.0.3... This is really pretty annoying... Anyway, I hope it's gonna help somebody else as well.