Dear Hans, one of the latest versions of MKIV breaks the following code: \edef\GNUPLOTfile {\bufferprefix gnuplot-\GNUPLOTnumber}% since \bufferprefix is not defined any more. Is there any reason for that? In particular ... meta-ini.mkiv: {\bufferprefix mprun.#1} page-app.mkiv: {\immediate\openout\scratchwrite=\bufferprefix\@@texdim.tmp page-app.mkiv: {\readlocfile{\bufferprefix\@@texdim.tmp}\donothing\donothing} page-app.mkiv: \executesystemcommand{texexec \bufferprefix\@@texapp.tex --once --batch}% page-app.mkiv: \executesystemcommand{dvips \bufferprefix\@@texapp}% page-app.mkiv: \executesystemcommand{ps2pdf \bufferprefix\@@texapp.ps \bufferprefix\@@texapp.pdf}% page-app.mkiv:% \executesystemcommand{texmfstart pstopdf \bufferprefix\@@texapp.ps \bufferprefix\@@texapp.pdf}% page-app.mkiv: [\bufferprefix\@@texapp.\ifdone eps\else pdf\fi] Thanks, Mojca