I too have found that the double-modifier (in my case the Option key) is broken using the latest QS under Snow Leopard.
It works as long as QS has the focus - say the Pref pane open - but as soon as another app has focus, the Double-Option doesn't work. Using a single modifier seems to be a bit of a puzzle for me - how do you stop QS popping up every time you hit the modifier key for something else? Or accidentally? I'm used to using Double-Option for QS, and Double-Command for GoogleSearchBox (which I rarely use, I must admit). I'm with jheftmann on this one - a fix would be very welcome, as the Double-option is burned into my brain...! ;)
