I've been using evernote web client and android app from last two years. On the web client I'm facing conflicts and data missing issue sometimes. But not happening while editing from android app. I've one suggession to solve this issue. Adding a save button on the web client will solve this problem I think, I dont know how are you saving the file, is it an interval based?. Anyway can you please solve this issue. This happened a lot of time for me.