My apologies - I did misunderstand your issue. I guess you've tried the uninstall-reboot-reinstall tango that sometimes works? If that hasn't worked, your next port of call is to raise a Support Ticket. Whilst EN say that they read the posts here (and I've no reason to disbelieve them), this forum is basically u2u so raising a ticket is the way to go.
To be fair, that's the way EN is supposed to work. If you need access to important documents no matter whether you have an internet connection or not, you need have a Premium account and create an "Offline" notebook on your IOS device where notes are stored locally but still synced (unlike a "Local" notebook on the desktop client which is _not_ synced).