I'm sure this has happened to most of us, but it just happened to me again, and I lost a lot of work. What? A face wiped out by a pose file setting all the morphs to zero. And I didn't notice until considerably too late. Really, a morph channel like "longface" that sets up a character, and one like "smile" that changes an expression, ought to be handled differently from one another and not get confused the way they are now. A bad bit of design that I hope will be fixed in Poser 5. Pose files are dangerous - there's no obvious way to tell what they will do.