Be more specific please, this could mean a number of things. Do you realize that on some/most things in poser you can select different parts to texture?? When you go to render you character or object it is usually on some default setting, see what this is and then adjust accordingly. Also, check to see if the transparency settings are set differently for this can make a big difference as well. Also, see if what you have selected is actually the item you are trying to render/texture?? Sometimes, with intricate materials it can be hard to determine what we have selected and what we have our settings on.