Testing dgiPf is exactly the same as testing Performer. Instead of using "perfly", use "diversifly". Go to the "models" directory in the dgiPf installation directory.
~> cd dgiPf-x.y.z/models ~> diversifly sub.pfb
A dgiPf window should come up and should display the sub model. Use the mouse to move, zoom, and rotate the model. If the mouse responds correctly then DTK checks out as well. If either one does not work then check the "Linux Install" DTK and dgiPf sections to make sure they were completed correctly.