This issue is probably because the text is not being rendered smoothly. Smooth rendering is required when high res images are shown on low res screens. Text is generally very high res. That's why it is only appearing fine in retina display. Still, it's not smooth even on a retina display and retina display users can tell the diff in main right side screen against text in the new window using a magnifying glass. The note text in a new window or in web browser looks great because it's gone through smooth rendering. Problem is just on the right side display inside the mac app.
I can see from the earlier messages on this thread that this bug is since 7.6 and now it's 7.8. This problem should not take much time to solve. Given that they already figured out to show smoothened text in a new window, they could use the same rendering methods in the main display too. It is clear that they are not aware of this solution. Because if they were they would have solved it.
This is a very bad thing about Evernote. No way to communicate directly with developers.
Thanks! This is a great app! Bbye Evernote.
