Mathworks Matlab version 2007b in Mac OS X 10.5 Leopard has a scrolling bug where the desktop GUI is sluggish and scrolls slowly. There is a bug fix posted at the Mathworks website, bug #412219, (login required). It’s due to a different default Java Graphics2D rendering engine used by OS X 10.5 (Sun2D), where OS X 10.4 used Quartz2D.