When 4.06 is installed on a computer on which Sketchpad has not been used previously, anti-aliased graphics are enabled by default. (There is no change in the existing anti-aliasing setting when an older installation is updated to 4.06.) Anti-aliased graphics improve the appearance of Sketchpad objects, at the expense of slower operation of the program. Use the System panel of Advanced Preferences to view or change this setting.
A point on a horizontal axis in a coordinate system now correctly considers its y-value to be +0.0 rather than ?0.0. This fixes calculations such as 1/y[a] (= +infinity) and arctan (x[a]/y[a]) (= pi/2) for a = (0, 0).
Defining a coordinate system by measurements now correctly determines the horizontal unit scaling from the first selected measure and the vertical unit scaling from the second selected measure.
(Mac) The toolbox no longer occasionally displays oddly-colored frames.
(Mac OS X) When re-saving an existing open sketch document (but not an existing HTML file or other file) with Save As, the type and creator of the file are now set.
(Mac OS X 10.3) Under Panther, pop-up menus no longer stick down when the mouse button is released without selecting a menu item.
(Mac OS X 10.3) Copying a caption of Chalkboard font and immediately creating a new caption no longer causes Sketchpad to crash.
