Thanks for that. No. No overlapping event. Its a simple one track edit. I was rendering to mpeg2 and that was creating all types of issues. Black frames. I have now renedered in MP4 with much better results however, now when I insert the media into Architect Pro 5 it takes forever, and I mean forevever (currently its building peaks at is at 7% at its taken 30 minutes to get to that point and I cant do much else whilst its doing that. Video wont play as the cpu is flat out buiding peaks.) so I wont know if the audio actually works until that point. The audio is fine when you play the full file in windows media play so I know the sound is embedded. Would I be better off keeping the audio track separate?