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Hi All, The simpleslides can not work any more after texlive 2011 upgrading, here's the example.tex from slideslides \usemodule[simpleslides] [style=BigNumber] \setupTitle [ title={Title of the presentation}, author={Name of authors}, date={Date of presentation}, ] \starttext \placeTitle \SlideTitle {The first slide} Write whatever you want. \SlideTitle {The second slide} Continue writing. \stoptext And the error output is resolvers > modules > loaded: 'simpleslides-s-BigNumber' (/home/joshua/texmf/tex/context/third/simpleslides/simpleslides-s-BigNumber.tex simpleslides > loading Big Number style system > command \NormalHeight is already defined system > command \NormalWidth is already defined system > command \PictureFrameHeight is already defined system > command \PictureFrameWidth is already defined )) system > begin file example.tex at line 10 ! Undefined control sequence. system > tex > error on line 11 in file example.tex: Undefined control sequence ... 1 \usemodule[simpleslides] 2 [style=BigNumber] 3 4 \setupTitle 5 [ title={Title of the presentation}, 6 author={Name of authors}, 7 date={Date of presentation}, 8 ] 9 10 \starttext 11 >> \placeTitle 12 13 \SlideTitle {The first slide} 14 Write whatever you want. 15 16 \SlideTitle {The second slide} 17 Continue writing. 18 19 \stoptext 20 \placeTitle ...\usesimpleslidestitlestyleandcolor \c!style \c!color \simples... l.11 \placeTitle ? Test env: texlive-2011 + t-simpleslides-2012.02.14.zip Best regards, Zhiguang