So i spent ALL DAY from 10am until 6:45 on this, re-doing the entire song from scratch twice. I am so frustrated.

Acid 7.0 never had this problem, but if I use acid 9 pro (x64) to render a song I JUST finished seconds ago to a mp3 file, the vocals slowly pull away from the instrumental track.

http://player.castlecraftfurniture.com/Track/Play/rick-oshea-its-on

(NSFW Explicit)

All the vocals and chorus drags more and more towards the end of the song. Yet it plays fine in the DAW.

Here's the original