Hi Taco Firstly, thank you and the team for the continued stream of updates etc to LuaTeX. I was wondering if the mplib section of the LuaTeX Reference should be updated to reflect that the MPlib library no longer uses mem files --- according to a post you made recently: ------------- Perhaps it has something to do with the fact that luatex 0.61.0 uses mplib 1.502, which does not use actual mem files. Not only that, but at the moment basically only the 'ini_version' mode of mplib works, so the way to set up a mplib instance with a preloaded set of macros is like this (ignoring error testing): function newmpx (memname) local preamble = "let dump = endinput ; input %s ;" local mpx = mplib.new { ini_version = true, find_file = finder, -- change this as needed } return mpx:execute(string.format(preamble, memname)) end Code like this has been added to ConTeXt, but I do not know whether luamplib has caught up with that yet. Best wishes, Taco --------------------- I'd forgotten this until I recalled reading your post. An example with a simple finder function and a simple test graphic would I think be most welcome. Best wishes and thanks again for the continued and marvellous work of the LuaTeX team. Graham