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I've updated my pgf/tikz install to Build date 2010-01-17 (the newest build from what I can see).

Now I'm getting the following error:

Package pgfkeys Error: I do not know the key '/tikz/cktb
aselength' and I am going to ignore it. Perhaps you misspelled it.

Here is the tex file (it's from http://www.texample.net/tikz/examples/logic-circuits-library/):
% Logic circuits library
% Authors: Juergen Werber and Christoph Bartoschek
\documentclass{article}

\usepackage{tikz}
% load circuits library
\usetikzlibrary{circuits}
\begin{document}



\begin ...

I'm trying to use tikz circuit library in a document I'm typing up. But I'm getting the following error:

/usr/share/texmf/tex/generic/pgf/frontendlayer/tikz/libraries/circuits/tikzlibr
arycircuits.code.tex:103: Package pgfkeys Error: I do not know the key '/tikz/p
os/.belongs to family' and I am ...