There is an issue with using the mac menu bar. Looking around the net exceptions like this one
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at
apple.laf.CUIAquaMenuPainter.paintSelectedMenuItemBackground(CUIAquaMenuPainter.java:146)
seems to be a known problem (sometimes it is MenuItemBarBackground or something similar).
A quick hack is to turn the menu bar off for leopard.
I just did a diff for FrinikaMain.java, but the same thing should maybe be done for Simphoney2Main.java.
If I did something wrong, complain to rusmus @ dcs.qmul.ac.uk
Here is a .jar that does not use the menu bar if the version 10.5.x