I love the new "edit read-only" it really makes working with abstractions and poly voices a breeze. Thanks for that!
I don't know if I should call the following a bug, but it is annoying enough to be considered one I think.
If you edit a poly voice which has subwindows belonging to subpatcher [p] objects, and you save the voice while this subwindow is open, Max opens all the subwindows of all the voices. In which case you might have to click for a minute or two to get rid of them.