From what I recall, I have experienced this on almost every monday morning when my laptop hasn`t been used during the week-end.
My laptop is in hibernate mode every time I don`t use it (current states is saved to disk and resume when I start using it).
After 2 days of hibernating, when I attempt to "continue" to use Evernote on monday morning, all notes would appear as blank, no exception.
The only solution I have found to this problem, is to kill all the evernote process. Cleanly quitting and restarting Evernote hasn`t resolved the problem (there are still process running) for me.
Is there any settings I should set Evernote to attempt to get extra client log information to better investigate this based on the above comment?