Mac OS X 10.7.3, macmini4,1
JDK 7u6 b09.
Start any code with a java.awt.List with setMultipleSelection(true); you cannot select noncontiguous items non-programmatically.
On Mac, Cmd+click does that: it doesn't work in 7u6, neither does Ctrl+click etc. You can select contiguous items by Shift+click though but that's not enough.