I'm not using Pro Pack, So I'm not much of help in that department. I don't know if you can convert to .bum outside Poser. Poser seems to have a problem locating the bump file, and it probably asks for every body part it attempts to load it on. Be sure that the files are in the Texture folder in the Runtime directory, that is the only place Poser looks for it. You can also open the MAT file in a text editor. Look for the exact location there, the path to the bump file is stated for every body part in the MAT file. Move the files to that location, or simply edit the text in the MAT file to correspond the location of your files.