I've encountered a bizarre error when rendering a project with a clip that has had its velocity increased.

I've tried several ways (so maybe I'm missing something), but the most obvious action was to Ctrl-reduce the length of a clip so that the velocity changes to fit exactly the velocity of the audio track.

[Basically, what I'm trying to do is to speed up a portion of the video by about 5%. I sped up the audio a little and then rendered the loop region that I wanted to speed up and reimported it as a single video clip.]

So it all works fine in preview mode - everything syncs up perfectly.

But when I render the project, it seems to double up the sped-up clip and when it gets to the end, it automatically loops it. I even unchecked "loop" in properties, but for some reason Vegas Pro ignores this when actually rendering the clip.

What's going on and how do I get around the problem?

(And if it's a rendering bug then how do I report it?)