I feel your pain fellow Premium EN members. I use EN across multiple devices - Winblowz laptop, Mac Air, iPad, and iPhone. EN v10.x.x has failed on Winblowz, MacAir, and iPad. EN v10.x.x has been duplicating notes. I have experienced some lame message about "duplicate note has been found" or something similar. I spend a few minutes to diff the notes to identify the current version. More recently EN v10.x.x prompts with a dialog that it failed to save and all my entries prior to the save are obliterated.
OneNote is looking like a good alternate solution. Does anyone know how to export from EN and import to OneNote?