Make sure you have sampling set to bycubic in the vue texture spot for that item. Check all channels for that texture picture. Like look in the bumps tab and others and set them all to bycubic if that picture is present. Render at a higher qualitly, like avoid final cause it will ignore big spots in your scene. Use broadcast min or higher. Make sure for some reason also that that texture is not set to not antialais. It's in the texture editor to right up at the top on the first tab.