The same here. The software renderer offset the image no matter what settings I tried. I even went as far as creating a brand new scene with another 16x16 texture off the web and still the same result.
I'm curious to see if it is related to the texture size. We are so used to using big textures. Will try 32x32 and 64x64 tonight.

Edit: It looks like one looses about a pixel on the border regardless of size. It just becomes less noticeable.