I cannot figure out how to do rectangular selection in Sublime Text 2 using only keyboard. What I seem to always come across is to do ctrl-shift-up or -down (which I assume mean arrow keys), as laid out here: https://stackoverflow.com/a/13796939/1022967
But when I try to use that, I must send an OS-level command, because what happens is that my window slowly recedes and shows me all of the open apps/windows I have going on my Mac (I forget what that's called -- like a dashboard of what I have running). This happens when I use this key chord in apps outside of Sublime Text 2 as well.
Do I have something misconfigured? Could I have alternate key chords to do this?