Here is my code in windows:

main.lua
local myimage = display.newImageRect( "test.png", 480, 800);

myimage:setReferencePoint(display.CenterReferencePoint);
myimage.x = _W/2; myimage.y = _H/2;

-- config.lua

application =
{
content =
{
width = 480,
height = 800,
scale = "zoomEven", imageSuffix =
{
["@2"] =.94,
},
},
}

and whats the issue?