Hi All During one of my periodic re-reads of the LuaTeX Reference Manual (for beta 0.79.2) I was interested to read the following on page 32: "NOTE: Also in LuaTEX 0.74.0 (this is a change in Lua 5.2), loading dynamic Lua libraries will fail if there are two Lua libraries loaded at the same time (which will typically happen on Win32, because there is one Lua 5.2 inside luatex, and another will likely be linked to the dll file of the module itself). We plan to fix that later by switching LuaTEX itself to using the DLL version of Lua 5.2 inside LuaTEX instead of including a static version in the binary." I use LuaTeX on Windows exclusively and have certainly encountered the "multiple Lua VMs" issue with Lua 5.2.x when trying to use LuaTeX plug-in DLLs I've written via Visual Studio. I build the latest LuaTeX versions via MinGW but also have a private port of LuaTeX to a native Windows build (that port is now very old --- beta-0.77.0-0 (rev 4641)). In that private port of LuaTeX I build Lua as a DLL so I can use my plug-ins but, as mentioned, my port is now really old and I'd like to use the latest versions of LuaTeX (built by MinGW). So, I was wondering if building Lua as a DLL during the MinGW build process is something that is planned for the near future? I must state that I'm not a professional or expert developer (just a hobbyist!!) so the following discussion on Stackoverflow (problems with using MinGW DLLs in Visual Studio due to C++ name-mangling) was definitely of interest to me: http://stackoverflow.com/questions/3924493/using-mingw-built-dll-in-a-visual... As always, thanks to everyone involved in the LuaTeX team for providing such an amazing TeX engine. With all best wishes Graham