Here is the code:
Export["~/Downloads/1234.pdf", Graphics3D[{Lighter[Black], Opacity[0.5],
Polygon@Table[{Cos[x], Sin[x], 0}, {x, 0, 2 \[Pi], 0.01}]}]]
in version 8, I get
in version 9, I get
why the color is different and also there are gridlines in the plot? Is there a way to fix the color and the gridlines in version 9?