Did this behavior start happening after a Poser crash? After Poser 8 crashed on me, I started getting the Mac equivalent of your error message (Poser Unexpectedly Quit) upon exiting Poser. The act of quitting normally caused it to "unexpectedly quit," if that makes any sort of sense. This has happened before after a crash, then it would go away after awhile. Somehow the crash caused P8 to do a mini-crash upon quitting (or opening a different scene while already in Poser).