I'm used to having Alt-Tab set to cycle forward through the windows of a single app and Shift-Alt-Tab to go backwards. I had this working on Yosemite by fiddling with the shortcuts in System Settings > Keyboard > Shortcuts.
But after upgrading to El Capitan, it is only Finder that responds to these commands, no other Apps, although they have not assigned this shortcut for something else.
Is there a way to enable this behaviour on El Capitan for all apps?