Ultramixer close up on itsown

I have instaled Ultramixer Demo on operation system Ubuntu 9.04 with Java 5.0 Runtime. When I try to load file into the player the program closes up automaticlly.Can you please give me an advice how to make it work. Thank you in advance.

what file types do you use? Does it create some crash files like .pid-files?

I am using MP3 format of the files, but this was not the problem. It was necessary to install Java 6 application and now it works properly. Thank you.

Well, I am quite sure you used a GNU-Java runtime that’s known not to work properly with UltraMixer. Please use a Sun implementation.