Lua stack corruption

Hi guys,
I have found a stack corruption in lua that I believe is caused by
luabind. The corruption occurs in the luaexpat callback table when I
set a value to a class bound by luabind. Without setting this value
the callback table is not corrupted. Here is some relevant code, would
be great if you could help me with it.

here is the script,
----------------------------------------------------
print("-- Loading Theme --")

require "lxp"

local theme = Theme()
local curWidget = nil

local function texture(name, args)
   widget = theme : NewWidget(args["name"], nil)

    for i=1,#args do
	if args[i] == "x" then
	    --if this is commented out it works fine
	    widget[args[i]] = tonumber(args["x"])
	end
    end
end

callbacks = {
    StartElement = function (parser, name, attribs)
	print("Element:",name)
	if name == "texture" then
		print("here")
		texture(name, attribs)
	end
    end
}

parser = lxp.new(callbacks)
local file = io.open("themes/default.xml", "r")

for line in file:lines() do
    print(line)
    parser:parse(line)
    print(parser:getcallbacks()['StartElement'])
end

file:close()

print("-- Finished loading theme --")

---------------------------------------------------------------------
and the code I bind with

---------------------------------------------------------------------
	luabind::module(GetLuaState())[
		luabind::class_<Theme > ("Theme")
		.def(luabind::constructor<>())
		.def("Init", &Theme::Init)
		.def("LoadTheme", &Theme::LoadTheme)
		.def("PushWidget", &Theme::PushWidget)
		.def("NewWidget", &Theme::NewWidgetData)
		.def("NewWindow", &Theme::NewWindowData)
		.property("Image", &Theme::GetImage, &Theme::SetImage),
		
		luabind::class_<WindowData > ("WindowData")
		.def(luabind::constructor<>())
		.def_readwrite("Widgets", &WindowData::Widgets),

		luabind::class_<WidgetData > ("WidgetData")
		.def(luabind::constructor<>())
		.def_readonly("name", &WidgetData::name)
		.def_readwrite("x", &WidgetData::x)
		.def_readwrite("y", &WidgetData::y)
		.def_readwrite("width", &WidgetData::width)
		.def_readwrite("height", &WidgetData::height)
		];
-----------------------------------------------------------------------------

for more info you can look at
http://www.gamedev.net/community/forums/topic.asp?topic_id=535089

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