Thank you everybody for all the suggestions, they've been quite helpful. Spit, you're right, the bump files are JPG files, I didn't think about that before! It makes sense then that I didn't have problems in P5. This would also line up with RHaseltine's idea about the bump map problem. So it seems that the problem came from the bump maps and the memory issue, right? What I don't understand is why didn't P4 ask to convert the JPG files to BUM files? I was using the V3 High Res maps from DAZ and loaded them with the MAT pose. Did that make a difference (as opposed to loading a bump map manually)?