invisible nodes on process visualization output

[chris...@gmail.com]

hi,

the nodes in the output of our process visualization sample are invisible.
they're invisible because when you hover/click on their expected positions,
you can see a tooltip/dialog w/ the corresponding node info.
the arcs are ok though.

[chris...@gmail.com]

this is now ok. the visual .jar we used was 7.3 instead of 1.0.0.