Quote - Poser also behaves very stupidly in this ... if it encounters multiple instances of the same texture file (like in this case "KateShoes" and "KateShirt" etc, it just writes the file again ... and again... and again.

Are those files dated in the future by any chance?

For managing the texture cache, Poser checks the file dates of the source textures and compares them to the files dates mip maps in the cache. This way it can react appropriately when files get changed in Photoshop between renders.