I am trying to use pstricks, and in particular pst-node.
All commands work, *but* the commands to position labels on the edges:
\ncline{A}{B} \ncput{label}
creates an edge and then puts the label on the node A, instead then on the edge (A,B).

The same happens with \naput, \nbput, \tvput, ...
Somebody has some idea? thanks a lot!