Ubuntu + Gnome 3.14 = lots of crashes?

During an upgrade the other day, my Gnome Classic login started failing. The normal Gnome login worked, but that looks too much like Unity.  After trying to fix it for awhile, I just went ahead and upgraded Gnome from 3.12 to 3.14.

That fixed the login problem, but random apps would crash when I right-clicked or used the menu bar or hotkeys.  Turns out this is being caused by overlay-scrollbar.  If this is happening to you, try:

sudo apt-get purge overlay-scrollbar

That worked for me. Everything is working great now.