Fran, the 'cracks' extend onto the hair. I think they're shadows cast by the 'fire'. There are some pretty good tips on a frire material here. You might want to think about a different shape. (metaballs, or more lattices) If the hair was positioned right in poser, and you exported it with the guy, then you might have nudged it in Bryce. I suggest that whenever you select an item you use ctrl-click to aviod bumping anything out of place. You can carefully move it back into place easiest if you use OpenGL and solo mode with the hair and head. (may require some scaling).