I suspect the problem in a particular module. The same problem I had when using wxLua, but with no such problems with VClua And yes, I read this thread. I also have a synchronizing between Lua threads. -- View this message in context: http://lua.2524044.n2.nabble.com/lua-close-IUP-crash-tp7645673p7645676.html Sent from the Lua-l mailing list archive at Nabble.com.