Diolma - Poser does'nt automatically reload textures at render time.  I often edit the V3 Head and Body textures that I have loaded into a scene(While they are loaded,) from Photoshop.  To view my progress from I need to; save over the file from Photoshop, then go into Poser and make sure that Render > Kepp Textures Loded is'nt checked, click Render > Reload Textures > and then Render.