problem now resolved.
you can use the mass scaling technique to adjust the time step, essentially you increase the material density which increases the time it takes or sound waves to cross the element. check the internet for full details.
I've installed on Windows 7 & Linux. On both systmes, I typically get the followong error message. So far I'ver ben unable tpo run any example problem. Any idea where to look for the problem? java.io.FileNotFoundException: (No such file or directory) at java.io.RandomAccessFile.open0(Native Method) at java.io.RandomAccessFile.open(RandomAccessFile.java:316) at java.io.RandomAccessFile.<init>(RandomAccessFile.java:243) at java.io.RandomAccessFile.<init>(RandomAccessFile.java:124) at gui.Processor.b_start_actionPerformed(Processor.java:523)...