It is a typical response for too little memory and/or some hair objects. Neftis hair doesn't like FireFly. Sometimes, if you are using a texture off an auxiliary Runtime, the first time of accessing it, Poser 5 can get hung up. Some light additions-- say you've changed the lighting several times, this can get Poser 5 very wrought up and it freezes either on Texture gathering or objects added, in my experience. If you do have a lot of RAM and/or swap space, consider upping your bucket size-- I used 150 last night and rendering was almost Poser 4 fast. This was with a fully head loaded M3-- no body morphs-- and set and lite hair and costume. Emily Ps, for all my doing things right, it still froze on me during the 7th render when I added an extra light. Might have been the light, but sooner of later, in my experience, you reach a render limit and it will freeze no matter what.