Hasta La Motion!

My job is pretty simple:
I have HD prores movs to import to Nuke, work on them and write them back to HD prores movs.

Sometimes (10% of the cases) Nuke adds some metadata to the finished movs, so in fcp they are handled as if they were interlaced. In fact they don’t look interlaced in quicktime player, but fcp adds some blur on the clips. This blur goes away if I set the interlacing to non in FCP, but comes back if I export and reimport this shot into fcp. As well as that damn interlaced setting.
The source clips aren’t interlaced either, they look just fine in fcp.

The same happens with every mov format. I can’t export anything else, because I’ll face with gamma issue then. What do you guys think?
Have you ever seen something like this before?

Thanks,

pH.