Using WMM on Windows 7 x64 and spend a long time fine tuning the timing on slideshows only to notice that an epic transition synced exactly to the audio/music gets shifted by about a half a second or more when the file is finally finished and saved to a wma file. I convert it to an mp4 file after that for stability during playback and still the timing is slightly off (which is really frustrating considering there's no way to share a true copy of your creations other than in the low resolution, in program, preview version. Why is this? Anybody found a solution to this or idea for a fix? 

Thanks for reading and help!