The test sometimes fails on linux-i586, Gnome/Compiz 2.24/0.7.8 with the current JDK 7 (~ b59):
(Note that the test system is single-head'ed even though the test is named "DualHeadTest".)

----------System.err:(6/379)----------
java.lang.IllegalArgumentException: Invalid combination of button flags
at java.awt.Robot.checkButtonsArgument(Robot.java:319)
at java.awt.Robot.mousePress(Robot.java:255)
at DualHeadTest$1.run(DualHeadTest.java:119)
at java.lang.Thread.run(Thread.java:717)
STATUS:Failed.Applet thread threw exception: java.lang.IllegalArgumentException: Invalid combination of button flags
result: Failed. Execution failed: Applet thread threw exception: java.lang.IllegalArgumentException: Invalid combination of button flags


test result: Failed. Execution failed: Applet thread threw exception: java.lang.IllegalArgumentException: Invalid combination of button flags