Whites on Video Flicker when rendered as AVI in Vegas Pro 9

I just upgraded to Vista 64bit, I'm using Vegas Pro 9, latest built (771 from August 09) and now when I render any project as AVI any white colors on the video flicker at any given time, like generated text that is white, teeth, shirt and sometimes the outline of a person. I noticed that it does not happen when outputting as a QuickTime. The problem is that for me to print to tape using the IEEE 1394/DV option I have to render it as AVI, if I used the QuickTime, Vegas would have to pre-render it as AVI and the same thing happens.

Any advice?

Thank you,

Ever Giron