Here is something else weird. If I put the clips into a HDV1080i60 timeline and slow them down to 50% and add a deinterlace filter with the upper field, the clip looks fine, then if I export that sequence out as a HDV1080i60 self contained movie and reimport it and then put it into the 8-bit uncompressed SD timeline, it looks OK. I don’t want to have to do this for every clip because I’m using lots of slo-mo, but it is strange that it worked.