Yes....the Neftis hair does present problems with firefly (or vise versa!) A note about setting memory with Windows XP: Not sure about the home version, but my XP Pro makes those memory adjustments automatically when a render is using more resources that are available. You'll get a little yellow triangle popup warning and then XP will simply shut down things that aren't needed to free up resources and allocate more memory to the rendering process. Pretty slick if you ask me!