Ah, found this topic since it was happening to me on my Mac Mini desktop. I always leave Evernote running, since it should be that kind of app.
The interface keeps changing, and Evernote popup windows appear blank every day when I sit down at my computer. It's like having a virus... yet coming from a program that I am paying for. I have been an Evernote subscriber for about five years.
PLEASE turn off all these updates, popups, and allow us to update on our own schedule. It's awful and I will migrate to another premium service if it continues.