This article continues the long line of Reasons I'm Not So Impressed With Apple's Implementation of Java.

Author's Note: When run on Mac OS X with Java 1.4.1, the scrubber bar has repaint problems when a file is opened but is not yet playing. It does not have problems on OS X's Java 1.3.1 or on Windows, so this may be a version-specific bug, and has been filed appropriately. You can look in the sample code for the many workarounds I tried to get the scrubber repainted correctly.