I’ve been having the same problem when exporting DV material into WMV 9. The workaround i’ve been using is to make a Video mixdown into AVID 2:1 and then export the material. Seems like the Windows Media codec is having some issues with DV material, maybe i can’t handle lower field separated media…? I am going to make a new post about this issue, to see if SOMEONE knows what to do with this. It’s been eating my heart out for about a year now!