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Lua crash in file "lbaselib.c" on the "luaB_print" [print] method!!

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Hello!
I've bound an SDK to Lua using toLua++.
The binding seems to run ok. In my C++ main() program I do
	int tolua_ScriptInterface_open (lua_State*);
	lua_State* L = lua_open();
	luaopen_base(L);
	luaopen_string(L);
	luaopen_table(L);
	luaopen_io(L);
	luaopen_math(L);
	luaopen_loadlib(L);
	tolua_ScriptInterface_open(L);
	lua_dofile(L,"testScript.lua");
	lua_close(L);
In my "testScript.lua" I can run lots of lib-methods: for instance, I can open a file and write to it, convert numbers to strings, even access exported SDK methods without problem. Here's a sample of what works:
x = tonumber("456")
y = tostring(666)
local f = assert(io.open("test.out", "wa"))
f:write(x, y, 111, 222, 666)
f:close()
HOWEVER: when I do the basic, simple
print(y)
it crashes in file "lbaselib.c" in method "luaB_print" (bound to print) near the very end on the
fputs(s, stdout);
statement, WHEREBY THE "s" PARAMETER HAS THE CORRECT STRING (I'm looking at this in VC++ 6.0)!!!
What's the deal here? Can anyone help? This is basic stuff!
Thanx,
Mark
P.S. When I run the same script "testScript.lua" from a standalone lua command-line .exe, it works perfect.

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