Not sure, I'll ask him. I remember he had to switch to Java 32 bit, cause he's on a 64-bit platform.
I'm using Mac OS X version 10.4.11 on 1.8GHz powerPC G5 and also on a 2.0 GHz PowerPC G5. I don't understand or know how to swtich Java 32bit versus 64 bit 
You can always get the latest version here: GitHub - alvieboy/arduino-oscope: A simple yet useful oscilloscope for arduino duemilanove
I'll try your new sketch (.pde and .h) but I cannot find your new arduino-oscope.jar !
What should i do to compile or build arduino-oscope.jar from your java files on my Macintosh ?