I have always worked without any problem, until now, with Arduino on my Power Mac G5 with OSX 10.5.7. Yesterday I installed Arduino on my iMac Intel with OSX 10.5.8. As I launch the Arduino ambient, I get an error message: " Cannot launch Java application. Uncaught axception in main method:....". I do not understand if the problem is of compatibility with OSX 10.5.8 or other reason. I have also installed the last version of Arduino USB drivers for Intel 2.2.10 of 6th August 2008.
Have a look here:
2009.06.17 Can't run Arduino after updating Java on your Mac? See the solution in the troubleshooting guide.
Many thanks. Now it works perfectly.