When playing Tony's demo applet in the browser on the Windows, message: "DEBUG: Got Repeat!!!" keeps throwing on the Java console from time to time

Tested JDK: 6u10
 FX-runtime: 1.0.1-b77
 OS/browser: Windows Vista(sp1)/ FF 3.0.4, IE 7


Steps to reproduce:
1) On Vista, using Firefox 3.0.4 or IE 7 to launch Tony's demo applet
http://jsqalab.sfbay/results/sqenfs-1/export1/comp/deployment/javafx/suites/integration/FCS1.0/b77/VideoSuiteTest/VideoSuiteTest.html

2) As you move the mouse in and out the applet frame, ff you see the "DEBUG: Got Repeat!!!" consecutively thrown on the java console, then the problem is reproducible