Ever since I upgraded to Ubuntu 13.10, I can't move workspaces to upper or lower workspace using the
Ctrl + Alt + Shift + Up/Down arrow. I am able to move them right or left. I can even move them down/up using the Workspace switcher on the launcher.
In ubuntu 13.10 the hotkeys to move windows to workspaces up and down have been changed:
Move window up: shift+super+page up
Move window down: shift+super+page down
(the super key should be the "windows key" on your keyboard)
You can change the hotkeys back to what they were from system settings, keyboard, shortcuts tab, "Navigation" menu, scroll down till you find "Move window one workspace up" and "Move window one workspace down" below it.
I did this myself.