This worked for me: Go into My Files, go to Device Storage, go to SnoteData, go to Action memo. Empty the directory. Delete every file in there or maybe move those files to another location, but just empty that directory.
Boom. No more waiting for the application to import those files, Snote comes right up and I've been using it for ten minutes with no problem. All previous notes are available, all features working fine as far as I can tell.
I'm using a Samsung Galaxy Tab 10.1 2014 edition.