I've had similar problems and initially suspected the huge bump maps. Thus, I reduced their size to 2000 x 2000 pixels. This helped, however Poser was still behaving funky on me (I'm using a 500 MHz machine, with 376 MB of RAM). So I took another approach. Not needing the high resolution maps for most of my work, I decided to reduce the size of both the texture and bump maps. First, I archived the original maps. Then, using Photoshop and working with copies of the DAZ maps, I reduced the resolution from 300 pixels per inch to 150 pixels per inch. This, in turn, reduced the maps from 4000 x 4000 to 2000 x 2000 pixels. Now I could have left the map names the same, placed them in the original texturesDAZCharactersStephanie folder, and used the MAT files as is. However, this ideal didn't appeal to me as I wanted to keep the original maps and MAT files as is -- even if they're giving me trouble. Instead, I created a second "standard" resolution folder, placed the nenamed modified maps in it, and edited a duplicate set of Stephanie MAT files to reflect the new file name and folder. Now everything works fine. Certainly, all I've done is side stepped the original problem. However, I think that it's a reasonable solution until someone comes up with a better one. Hope that this helps.