\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\shadedraw[draw=blue]
(0,0) circle (1);
\end{tikzpicture}
\end{document}
can produce a shaded circle when it is compiled with latex-dvips-ps2pdf. However, compiling it with pdflatex only produces a circle without shading.
I use the latest TeX Live 2011 distribution. I have updated the package several days ago.
What is the source of problem?
\listfileswould be more interesting, but simply stating your TeXLive version and the one of PGF/TikZ would be just fine. – Martin Scharrer Jan 13 '12 at 11:10