It has a menu system: I load the object, with a query to the DB.
You connect to a project, list the objects, load the objects.
But then, no menu choice seems to display the drawings.
I changed zoom factor, panned, switched views (2D,3D).
Activated layers, tried almost everything...
I feel a bit silly...
Error messages are redirected to a graphic window, so everything is
under my eyes...
BTW, I exported from CMDline some drawings into DXF and they are
readable (elsewhere, of course)