I solved that sync problem definetly. I have iphone 5. My sync problem's reason coming from my PC program. Sync problem started on my iphone after last update evernote on my PC. I tried everything from my iphone and no success. Then I investigate evernote user interface on my PC. I realized that "Conflicting Changes" note upper left corner. Before update that was different. I clicked on it and choose other option. That's it . Please try and inform me. Thanks.