Dear Francois! The following document was prepared on Linux 3.11.10-7-desktop openSUSE 13.1 (Bottle) (i586) KDE 4.11.5 Please find the output of 1.0.7.16, which was downloaded from http://software.opensuse.org/package/TeXmacs Kurt@lenovo:~> texmacs -v TeXmacs version 1.0.7.16 (c) 1999-2006 by Joris van der Hoeven Kurt@lenovo:~> texmacs test.tm TeXmacs] Loading corktounicode TeXmacs] Loading cork-unicode-oneway TeXmacs] Loading tmuniversaltounicode TeXmacs] Loading symbol-unicode-oneway TeXmacs] Loading symbol-unicode-math TeXmacs] With linked TrueType support texmacs.bin(2035) KMimeTypePrivate::ensureXmlDataLoaded: Missing field in "text/x-wxmaxima.xml" texmacs.bin(2035) KMimeTypePrivate::ensureXmlDataLoaded: Missing field in "text/texmacs.xml" texmacs.bin(2035) KMimeTypePrivate::ensureXmlDataLoaded: Missing field in "text/x-lisp.xml" TeXmacs] Loading corktounicode TeXmacs] Loading unicode-cork-oneway TeXmacs] Loading tmuniversaltounicode TeXmacs] Loading unicode-symbol-oneway TeXmacs] Loading utf8tolatex Here everything is fine, but for 1.99.1 one gets the following result: Kurt@lenovo:~> texmacs -v TeXmacs version 1.99.1 (c) 1999-2013 by Joris van der Hoeven and others Kurt@lenovo:~> texmacs test.tm TeXmacs] widkit-warning, Locale could not be set TeXmacs] With linked TrueType support /usr/share/TeXmacs/progs/convert/latex/tmtex.scm:471:33: In expression (filter (cut ndef-style? <> ...) t): /usr/share/TeXmacs/progs/convert/latex/tmtex.scm:471:33: Unbound variable: filter Kurt@lenovo:~> rpm -i TeXmacs-1.99.1-1.i386.rpm Please find test.tm here: <\body> simple test: +b> as well as the correct tex output \documentclass{letter} \usepackage[english]{babel} \begin{document} simple test: $a^2 + b^2$ \end{document} generated by 1.0.7.16 I hope this is helpful Best regards, Kurt