hi, does this error message ring a bell? same problem with luatex 0.27 and 0.28 using the latest beta. mkii works ok. [..] ! LuaTeX error r:/tex/texmf-context/tex/context/base/mlib-pdf.lua:92: bad argument #-1 to 'pen_info' (MPlib.gr expected, got table) stack traceback: [C]: in function 'pen_info' r:/tex/texmf-context/tex/context/base/mlib-pdf.lua:92: in function 'pen_characteristics' r:/tex/texmf-context/tex/context/base/mlib-pdf.lua:296: in function 'flush' r:/tex/texmf-context/tex/context/base/mlib-pdf.lua:45: in function 'convert' r:/tex/texmf-context/tex/context/base/mlib-run.lua:255: in function 'process' r:/tex/texmf-context/tex/context/base/mlib-pps.lua:719: in function 'graphic_base_pass' r:/tex/texmf-context/tex/context/base/mlib-ctx.lua:19: in function 'graphic' <main ctx instance>:1: in main chunk. \processMPgraphic ...alizations ;#1;\!!es , "" ) } \else \ctxlua { metapost.g... \handleuniqueMPgraphic ... {\processMPgraphic {#3} }\setxvalue {\@@MPG \overl... \douniqueMPgraphic ...#1][#2]\getvalue {\@@MPG #1} \empty \elabelgroup \executedefinedoverlay ...x {\the \everyoverlay #2 }}\setbox \scratchbox \hbo... \next4 ...d {\??ov \currentbackground }\donothing }}}\wd \extraframebox \zer... \rawprocesscommaitem ...commalevel \endcsname {#1} \expandafter \rawprocessco... ... [..] i also have some problems with endless loops here. luatex (>=0.27) runs wild, comsuming one cpu and memory; no error messages or logging. as i have currently no time, i simply switched back to an older version. 0.25.3 works ok, but has a problem with drawing small line widths (seems to be fixed in 0.28). sorry, no time for digging any deeper. regards, peter