How can I fix smart playlists with live updating to update again in itunes 11?
As a workaround I found out the following: If I switch off 'live updating', then sync my iPod, terminate iTunes, disconnect my iPod, restart iTunes again, and switch playlists, I can switch on 'live updating' again, and it seems to work.

If then (after "fixing" one playlist) I go to a different 'live updating' playlist, I just disable, then enable the 'live updating', and the playlist seems to work again.

This is very tedious, but better than recreating the playlist from scratch every time.

I'd be very interested in hearing other experiences.