Riddokun- I could only guess at how poser does its tetxure storage but I do know that ultimately, as in any render engine, the texture will have to be unpacked to full size when rasterized in the engine. Now it could be that poser stores the item as a compressed JPG but I'm doubting that highly. There are texture compression techniques that allow compressed textures to be rasterized but that's slower. Now what could be happening is perhaps poser fire fly has a bug in its jpg decompressor that crashes FF on certain jpg types and in only certain situations. That seems more likely than compressing the texture as a smaller jpg.