There are lots of posts on this about Unity, this is about GNOME shell. As with other posters, I use apps (Inkscape in particular) that uses Alt-Click and Alt-drag. GNOME shell is grabbing this off me and thus disabling features in the application. I have tried using ccsm's Move plugin - you can turn this off and you still get Alt-drag window moving. using gconf editor to change /apps/metacity/gen