Windows 7 beta and Badaboom deinterlace

I noticed if I use Badaboom on some 60i footage from my AVCHD canon camcorder, that the de-interlace doesn't work right. The resulting video appears interlaced.
But if I boot up into Vista 32bit, and use Badaboom there, it works fine.

So something about WIndows 7 64bit is interfering with Badaboom's deinterlace function