You do NOT need to use UVmapper. But Grouper (see previous threads for URL) is very helpful. I/O errors seem to result from various problems; sometimes just lack of memory. Malformed props/clothes can indeed be a problem also. It's not necessary to move the texture files around as long as you don't mind directing Bryce to the correct directory when you load the .obj. I keep all mine in Poserruntimetextures. Once Bryce has been shown the correct place for one of the files, it will find any others in the same directory by itself.