Thanks for the hints, and of course you're right. But unfortunetly this does't solve my problem ... sigh ... I can't believe, that I'm the first one who has this problem. I checked this on three computers .. always the same result ... strange ... The requester with "Quantizing Colors" is on the screen and doesn't disappear. But you can work with poser as usual ... You can even start a new python program ... but a swf will never created from python ...