Weird window border on gnome apps on Ubuntu 16.04

Last night I upgraded to Ubuntu 16.04 from 15.04 and now a bunch of my
gnome/Gtk applications have this weird black border all around and no
Fluxbox titlebar which makes it weird to tab things together or shade them:
http://imgur.com/a/tzA4q

Other apps like Gimp, Scite, Firefox, Chrome are fine, but the Gnome ones
suffer from this, gthumb, eog, gedit.

My fluxbox settings remain the same, but I am unsure of what might have
changed in the Gnome configurations, I never really used or configured it
manually.

-- 
Jj
http://isgeek.net/
- Don't make me hate email: http://goo.gl/hk9q

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