A few of my models when exported from Poser 4 to Bryce, develop serious problems, e.g. bits dissappear or parts are out of place. If you have these problems then when you export, use the attached settings (screen shot) I've shown here. DO NOT tick the 'include existing groups in polygon groups' as that option is what's screwing up Bryce. This has been tested and this is the sollution. Don't ask me why, I'm no expert. These instructions apply to Poser 4 only. I am still finding model making in Poser 5 a complete mystery!!!