In reply to Andrew Nacin.

Nope. In Firefox and Chrome (Windows), Ctrl-S triggers a browser "Save As", not a WordPress save. Also, in WordPress edit page I see an "update" button, not a save button as you reference. Did you actually test this in Windows Andrew?

In any event, this was not an issue until this update so-called.
I'm with Julie, I loathe this new version. It's jittery as others have said, and it defeats its purpose when time comes to save edits. The prev. version (when I clicked the update button in the top-page on-demand menu) left my distraction-free screen precisely where I was working, sigh. Please bring it back.