Changed the installer at
http://www.autohotkey.com/download/ :
Fixed ControlSend of modifier keys (e.g. ^{end}) when a script targets one of its own GUI windows. [thanks beardboy]
Changed PixelGetColor and Window Spy to retrieve colors in hexadecimal rather than decimal format, which makes it easier to visualize a color based on its blue, green, and red components. This change should not affect existing scripts.
Improved ControlSend so that if a script explicitly specifies modifier up and down events, such as {Alt down}f{Alt up} rather than !f, those events will be sent in a way less likely to interfere with the active window. Note: In prior versions, ControlSend did not correctly handle explicit modifier up and down events such as {Ctrl down} and {Ctrl up}.
GUI: Fixed DropDownList/ComboBox's drop-list not obeying the specified height on Windows XP. [thanks Titan]
GUI: Changed DropDownList and ComboBox on Windows XP so that if the height is unspecified, the control's drop-list height will take advantage of the amount of desktop height available.
GUI: Added command "Gui Flash", which inverts the color of the window's title bar and/or taskbar button. [thanks beardboy]