Just to elaborate on the quick fix for those using Kerberos.

As has been posted by several others, you can drop to the console and
kill the gnome-shell process, start a new gnome-shell and return to your
desktop.

If you are using Kerberos you should remember to set the KRB5CCNAME
environment variable to keep all your windows in the same kerberos
session.

The pattern becomes:

(CTRL-ALT-F1 to the console and login)

killall -9 gnome-shell
export $(xargs --null --max-args=1 < /proc/$(pidof gnome-session)/environ | 
grep KRB5CCNAME=)
gnome-shell -d :0

(CTRL-ALT-F7 to get back to the desktop)

...and all of your gnome-session windows will keep using the same
kerberos credentials cache.

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https://bugs.launchpad.net/bugs/869408

Title:
  gnome-shell hangs when switching to a running VMWare Player Window in
  Activities menu

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