I'm using Vegas Movie Studio 9.0. I have a long file (about 50 minutes) that I drop into the trimmer. I can edit the first say, 43 minutes just fine - audio + video both show up. However, at the 43 minute mark in the trimmer, the video still plays but suddenly, there is no more audio. The same thing happens if I add it to the timeline.

I know this video is ok - if I open and view it in windows media player, its all good. There is definite audio past the 43 minute mark.

Any idea what gives, workarounds, or how to fix??