Printing blank page with HP DesignJet T610

Hello.

I'm using lastest version of DraftSight with the latest drivers of my plotter HP Designjet T610 on Windows 7/64bits platform.

On the preview pane of Drafsight, I can see all ok.

Before printing on the plotter, one can preview output of the plotter; I see only a blank page. And finally, when executing the print, blank page effectively comes out.

I have installed also 2D Editor Sp4 (older sister of Draftsight), on the same PC; ALL OK for the printing !

Does anyone have an idea ?

Does DrafSight have  a limiation in its free version ?

Please help...