Hello, it seems that there's a problem with finding texexec.rb in MikTeX: c:\temp\mojca\docs>texmfstart --verbose texexec texmfstart version 2.0.3 expanding 'texexec' to 'texexec.rb' locating 'texexec.rb' in current path '.' locating 'texexec.rb' in caller path './../ruby' kpse : direct (fallback) fatal error: undefined method `progname=' for nil:NilClass texmfstart.rb:678:in `find' texmfstart.rb:1230:in `execute' texmfstart.rb:981:in `process' texmfstart.rb:1224:in `execute' texmfstart.rb:1249 unable to locate program execution failed In contrast: ---------------- c:\temp\mojca\docs>ruby "C:\Program Files\MiKTeX 2.7\scripts\context\ruby\texmfs tart.rb" --verbose texexec a texmfstart version 2.0.3 expanding 'texexec' to 'texexec.rb' locating 'texexec.rb' in current path '.' locating 'texexec.rb' in caller path 'C:/Program Files/MiKTeX 2.7/scripts/contex t/ruby' registering 'texexec' as 'C:/Program Files/MiKTeX 2.7/scripts/context/ruby/texex ec.rb' 'texexec.rb' located in caller path registering 'THREAD' as 'C:/PROGRA~1/MIKTEX~1.7/scripts/context/ruby' starting texexec using 'system' call: ruby C:/PROGRA~1/MIKTEX~1.7/scripts/context/ruby/texexec.rb a TeXExec | processing document 'a' TeXExec | no ctx file found TeXExec | tex processing method: context TeXExec | TeX run 1 TeXExec | writing option file a.top TeXExec | using randomseed 1233 TeXExec | tex engine: pdftex TeXExec | tex format: cont-en This is pdfTeX, Version 3.141592-1.40.4 (MiKTeX 2.7) Running pdftex... This is pdfTeX, Version 3.141592-1.40.4 (MiKTeX 2.7) (INITEX) entering extended mode systems : system commands are disabled ("C:\Program Files\MiKTeX 2.7\tex\context\base\pdfr-def.tex") systems : begin file a at line 1 TeXExec | runtime: 20.547 [here, pdfTeX crashes] execution failed c:\temp\mojca\docs>