Hy Ive also followed the instruction mentioned in : lyx 2 and sweave
but for me it also doesnt work What puzzels me is that there s a message Setting LC_CTYPE=en_US failed and that when I look at the latex source settings for the language with babel apears somewhere within the document and not before \begin{document} Is it possible that this happens only for lyx user that have a different language setting (e.g. german in my case or french ...) ? .../Ressources/examples/sweave.lyx works on an Win 7 System with lyx 2.0.0, R version 2.13.0 and MikTeX 2.9 but any document I create with non English settings fails Rainer