See this post: http://developer.longtailvideo.com/trac/ticket/1494#comment:1
Which claims a fix has been made (to keep playing from the same position when changing quality)...
except it's no longer possible to switch quaily while playing + the controlbar isn't shown in html5-mode.
I posted it here (http://www.longtailvideo.com/support/forums/jw-player/setup-issues-and-embedding/24636/hd-plugin-and...) first, but it should really have been posted in the bug-section..
And here's the original post (which I should have continued in..)
http://www.longtailvideo.com/support/forums/jw-player/using-playlists/22883/hd-not-switching-to-same...