Hi Dave,
It’s a pretty big channel, and their process has been running for some years now, can’t imagine it’s something wrong on their side.
We edited the story yesterday on HDTV 1080i50 timeline. Exported it as such. It’s flashing as interlaced on MediaInfo. However the technical dpt of the channel called me this morning saying they won’t broadcast it as it was shot in progressive…
Out of options …I might give the AE tutorial a try!