Plot Clipped Viewport in PDF problem. rectangular is ok

Hi my friends,

i'm trying to plot to pdf a work by paperspace viewport. I've a sheet with 3 different viewport.. a rectangle viewport, and 2 polygonal viewport. Every viewport is on a definite layer called "RIQUADRO".

When plot to pdf, the two polygonal viewport disappear.. the rectangular viewport is ok. I tried to convert the rectangolar viewport to polygonal viewport .. and also the 3th viewport gone.

If make 3 rectangular viewport everything is ok.

If plot directly to my printer, everything is ok also with polygona viewport.

I can't find the problem. I've tried to create another one pdf style printer.. but nothing change..

Anyone???

Thanks mate