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Apologies if this is old hat. In the sources for Lua5.2w2, in lobject.c line 99, is case LUA_OPUNM: return luai_numunm(N, v1); a typographic error for case LUA_OPUNM: return luai_numunm(NULL, v1); ? -- Gavin Wraith (gavin@wra1th.plus.com) Home page: http://www.wra1th.plus.com/