I'm working through the above book and am stuck trying to find why the program doesn't run as I would expect. It compiles, it runs and it plays the midi track but there are no rectangles drawn in the panel. If I change to or remove the if statement entirely, then I get one rectangle drawn before any sound plays, so the paintComponent method is doing part of its job. I've tried running the program on both Linux F18 and OS X, with the same result. The full source (sorry, it's longish) is included below.