Preface: Most of my notes are written in Markdown and sent to Evernote via the sublime-evernote plugin.
Since the 6.6 update, I've noticed a change in the way header elements and lists are rendered together in the Windows client. Specifically, there is whitespace missing between the end of unordered/ordered lists and heading elements when followed by another header of the same level (in this example, <h2>).
This was not a problem prior to the recent update.
The note in the Android and web clients appears as expected.