As I found out the hard way as usual, the Flash CS4 Authoring Environment has an ugly little glitch:
depending on the focussed window the shortcut STRG+G groups selected items on the canvas (if the canvas has focus) or fires the dialog to go to a certain line in the script window (if that, you guessed it, has focus). So watch out when you're in some shortcut routine while editing as you might mess things up...
