In relation to the initial question about PDF rendering problems with objects that have gradients in it, I read that FreeHEP is not maintained any longer.
I just started using yEd today and thought it's a really great alternative to Gnome's Dia, but with the PDF export not working properly this tool is kind of unusable for me.
I know about the possiblity of exporting to SVG and then using inkscape to save the PDF, but this kind of makes it hard, when you are editing a lot of diagramms.
Will there be any switch of the PDF library any time soon, so it makes sense to start using yEd, knowing that there will be a change soon?