I currently use a desktop (Windows 7), a laptop (windows 8.1) and a tablet (Android) With a Premium account. Synchronizing has never been a problem. Just recently I established a problem with my desktop which advises me "Sync failure due to unexpected behavior at client side" Neither the laptop, not the tablet give me the same message. Some synchronization is occurring as certain things I look for an they are there across all devices. Others that I look for are not. It appears to be random. I have uninstalled Evernote from my desktop and after reinstalling get the same problem. So not a version on my desktop anomaly? I have created another account which synchronizes perfectly across all devices so it is not a communication issue my computer to the web problem? And given the Premium membership I Would have thought not a volume transfer problem? And Evernote themselves appear not to have any suggestions as I have only computer replies generated from the helpdesk, no people yet? Any body else experienced something similar? What solutions worked?