I was finally in a position to test this release on a machine with Mac OS X 10.5.2 and it failed to start, instead it generated the following error:
java.lang.UnsatisfiedLinkError
The error went away when I replaced the shipped version of librxtxSerial.jnilib with the librxtxSerial.jnilib version here.
Version 0012 runs fine on the same machine so I wonder if an (unintended?) configuration change in the build has resulted in the problem.
More details on fixing the gnu.io.RXTXCommDriver UnsatisfiedLinkError error here.
--Phil.