Windows 7, all updates made in last few days.  The last wmv file I saved from a wlmp file had a frame that included a "pan zoom" feature.  The rest of the video is perfect including the audio music, but this one frame stutters in playback although it is perfect in the wlmp version.  This is the first time I have used this feature in one of my videos. I assume I have MovieMaker 11 since I have never knowingly installed MovieMaker 12.