The latest version of Arcade Game Designer has now been released.  This has a couple of bug fixes which will make it easier to save a game to tape and a screen corruption fix for the jump table editor.  Also new is the RGB value indicator in the corner of the palette editor.

Version 4.5 should be compatible with versions 4.0 upwards, meaning you can load games designed with those earlier versions into 4.5 and just carry on.