I am also experiencing having all blank notes on all three of my Macs running 10.14.6 This occurs not everyday and may happen when waking the Mac from sleep.
This is not affecting me on iOS, only on my 2 iMacs and MBAir.
So far I can quit and restart Evernote on my Macs and then the contents consistently appear. Log files attached.
v 10.5.7 build 458420 public
This next is probably off threaded topic but I am extremely disappointed in the revisions to Evernote involving removal of shortcuts for building tables and inserting a checkbox and now checkboxes when ticked force strikethrough text to make it difficult to read what I've marked as done.
Now, blank notes!!
If Evernote keeps going this direction breaking and downgrading the app with "innovation", I will eventually be forced to replace my workflow from Evernote to OneNote or the Notes app.