I just encountered a quite hefty bug in Files/Nautilus 3.10 on Arch Linux.
When running a dual monitor setup,
and you maximize Files on the display that does not have the Gnome-Shell top bar
, the Files “header bar” will disappear when dragging the maximized window down,
and will not ever come back.
Some people are saying that random keyboard window shortcut stuffs also causes this problem.
To fix it reset Files settings with dconf.
dconf reset -f /org/gnome/nautilus/
Gotta love bleeding on the edge.