Hello The following code gives an error (current beta and version from texlive 2014): \usemodule[tikz] \usetikzlibrary[datavisualization] \starttext A \stoptext The log gives the following error: tex error       > error on line 682 in file /usr/local/texlive/2014/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/datavisualization/tikzlibrarydatavisualization.code.tex: ! Missing number, treated as zero   ^ l.682 {\catcode`\^^                  M=\active% 672         \def\pgf@temp{#1}% 673         \ifx\pgf@temp\tikz@lib@dv@auto@attribute% 674           \tikzdatavisualizationset{\tikz@dv@axis/label/.expanded=$\noexpand\mathit{\pgfkeysvalueof{\tikz@dv@axis/attribute}}$}% 675         \else 676           \tikzdatavisualizationset{\tikz@dv@axis/label={#1}}% 677         \fi 678       }, 679       label/.default=\tikz@lib@dv@auto@attribute, 680       % 681       % Strategies 682 >>    % 683       tick placement strategy/.style={\tikz@dv@axis/@compute at positions={#1}}, 684       linear steps/.style={tick placement strategy=\tikz@lib@dv@compute@at@linear}, 685       % 686       % Attribute setter 687       % 688       goto/.code={\tikz@dv@goto{\tikz@dv@axis}{#1}}, 689       goto pos/.code={\tikz@dv@goto@pos{\tikz@dv@axis}{#1}}, 690       anchor at min/.code={\tikz@lib@dv@special@at{\tikz@dv@axis}{\tikz@dv@min@anchor}}, 691       anchor at max/.code={\tikz@lib@dv@special@at{\tikz@dv@axis}{\tikz@dv@max@anchor}}, 692       %