Hehe, I'm finding that the Material Room bug is sometimes persistant too. When you use the MATs to change the textures, sometimes you have to double-click the new texture MAT twice. For example: I first Apply the Indigo MAT to the skirt. I change my mind, so I apply the + Reset Skirt MAT. I now decide I want to use the Sanguine MAT. Going into the material room, it wants to revert back to a textureless state. So I double-click the Sanguine MAT again. It stays. LOL So, if Poser 5 acts up on you, pop it in the nose!

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