Cannot add columns

I use the Last Added column almost every time I put in new cards. It hasn't worked for me for the last few days.

I have tried:

Logged in
Not logged in
Windows 7 - Firefox/IE/Chrome/Opera
OSX - Safari/Firefox
Clearing cookies/cache
Trying to add them on someone else's account view
Restarting my PC
Removing all available columns
Adding all columns