After WP 3.7.1

Yesterday I updated to WP 3.7.1,

Now the admin layout is screwed, even with the menu collapsed,
The 2 column editing pages don’t work (Mac OS-X 10.9, Safari-up to date)
Problem also occurs in Firefox

I’m having to work with the editor at 125% (or more) of screen width before the buttons and toggle links (page attributes etc.) in 2 column mode appear or (sadly) use 1 column mode.