I couldn't reproduce either:
1) Using Artwork tab of Properties
2) Remove existing embedded art
3) Add new image (set to be embedded)
4) OK and instantaneously the Now Playing Art was updated
but then
1) Select another track on Album (not playing)
2) Using Artwork tab of Properties
3) Select to Apply to All tracks on Album
4) OK
5) Now Playing Art is still showing old
6) Switch to Selected and back to Now Playing doesn't fix it
7) Using Artwork tab of Properties on playing track shows correct Art
Added as:
http://www.ventismedia.com/mantis/view.php?id=9369Please post your exact steps if they're different from what I saw.