Ulead delay problem?

[imported_Jdo]

I'm using Ulead VideoStuiod 9 and I am trying to add subtitles to a video. The problem is that it's all synced and stuff but when I publish the video, the subtitles go out of sync as time goes on leading up to a 3 second delay at the end of the 10min video!

What can I do to fix this? Thanks.