Fair enough, I will try that. Might I suggest that the jar file checks the jdk/jre version and refuses to start up if the jdk is unacceptable? That would have saved me quite a bit of lost work.
The reason I was running the jar file directly was that the linux install script (which I presume installs its own jre) complained that my system was 64bit and exited immediately.
That being said, I wound up installing the windows version, the file loaded ok, and my co-workers were pretty impressed with my diagram, so thanks for the very useful software.