In Ubuntu 14.04, when you hold Alt and click a window, you can drag it around. As I understand, you used to be able to disable it through gconf, but Unity doesn't read settings from here any more (hence not being able to change where the window buttons are any more).
There's no setting for this by default, and I can't find anything in Unity Tweak Tool either. Is there anyway to disable Alt+click window movement in 14.04?