Hi Martin Not sure if this is a problem related to recent code changes, but if it is not, I am unsure what I did to create it, as I haven't changed anything at my end as far as I know. A subset of this project has been compiling fine, but when I try to compile a larger section I get the error below with f02bd7a, and all the versions I have saved, until c43b32a (2021-03-08) which is the last good one that will compile it. It reports itself in logs incorrectly as therion 5.5.7+67fffb0 (2021-02-22). I have not done any other investigation yet, but expect that you might be able to track something down based on the above and the snip from my f02bd7a log file as below. Bruce . [3060] [3061] [3062] [3063] [3064] [3065] [3066] [3067] [3068] [3069] [3070] [3071] [3072] [3073] [3074] [3075] [3076] [3077] [3078] [3079] [3080] [3081] [3082] [3083] [3084] [3085] [3086] [3087] ) Here is how much of MetaPost's memory you used: 840264 strings using 21320784 characters 14137540 bytes of node memory 1900 symbolic tokens 11i,82n,36p,1657b,5f stack positions out of 16i,98n,45p,1853b,6f 3104 output files written: data.1 .. data.4017 #################### end of metapost log file #################### converting scraps ... done making map ... done ######################## pdftex log file ######################### This is pdfTeX, Version 3.14159265-2.6-1.40.21 (TeX Live 2020/W32TeX) (preloaded format=pdftex 2020.6.19) 25 APR 2021 16:55 entering extended mode **data.tex (./data.tex (./th_enc.tex) (./th_texts.tex) (./th_resources.tex (c:/Program Files (x86)/Therion/texmf/tex/glyphtounicode.tex)) (./th_fontdef.tex{c:/Program Files (x86)/Therion/texmf/fonts/pdftex.map}) (./th_formdef.tex Normal \count register pool exhausted, switching to extended pool.) (./th_pagedef.tex (./th_legend.tex) ! Undefined control sequence. <argument> ...rr \hbox {\pdfrefxform \THXBaaabdaa } \rlap #1->\hbox to\z@ {#1 \hss } l.6886108 \PBcorr{2560.04}{2665.28}{\THXBaaabdaa} % The control sequence at the end of the top line of your error message was never \def'ed. If you have misspelled it (e.g., `\hobx'), type `I' and the correct spelling (e.g., `I\hbox'). Otherwise just continue, and I'll forget about whatever was undefined. ! Missing number, treated as zero. <to be read again> } \rlap #1->\hbox to\z@ {#1 \hss } l.6886108 \PBcorr{2560.04}{2665.28}{\THXBaaabdaa} % A number should have been here; I inserted `0'. (If you can't figure out why I needed to see a number, look up `weird error' in the index to The TeXbook.) ! pdfTeX error (ext1): cannot find referenced object. <to be read again> } \rlap #1->\hbox to\z@ {#1 \hss } l.6886108 \PBcorr{2560.04}{2665.28}{\THXBaaabdaa} % Here is how much of TeX's memory you used: 5700 strings out of 94623 61269 string characters out of 1150079 1760549 words of memory out of 6587292 7351 multiletter control sequences out of 15000+50000 21229 words of font info for 66 fonts, out of 1000000 for 2000 1416 hyphenation exceptions out of 5000 12i,5n,9p,459b,73s stack positions out of 5000i,500n,10000p,200000b,50000s ! ==> Fatal error occurred, no output PDF file produced! ##################### end of pdftex log file ##################### C:\Program Files (x86)\Therion\therion.exe: error -- pdftex exit code -- 1 writing xtherion file ... done