Thanks for the replies, Timoteo1. This helps to clarify. I am a Win2000 user, am IT professional, and I fully agree with you about this OS. XP Pro has been relegated to my laptop only. One of the reasons that its good that you reply, is that it helps to narrow things down a bit. I honestly don't have the "flicker" problem in Vue 4 that you have, and I've never had it. But I'm not a Poser person at all, so maybe we have some wierdness (poor programming design) here in the Poser/Vue 4 interface. Its goood to know that we are not talking about a Codec issue, as those are a real can of worms. Back to the point though, Vue Pro supports about 18 modern codecs, as well as that old Microsoft AVI dog, and it seems to handle all the .mpg varieties well. I had some problem with Quicktime, however, but my Quicktime stuff is seldom used, and so I may need to get all my Quicktime Pro stuff up to current.