I tend to leave the preview window up because I am on a lot of mailing lists. As I scroll through the lists with my arrow keys and holding the shirt key to select multiple messages it used to update the preview window when I changed messages. Now it flashes like its reloading the message, but the first selected message is what comes back onto the screen. It worked in both 7 and 8.0.1 of notes.
Steps to reproduce:
1: Open preview pane
2: Select a message
3: Hold shift key and use up/down arrow or mouse to navigate to the next message
Expected: Preview pane will refresh to most recently selected message
Actual results: Preview pane refreshes to first selected message.