fcp 10.1.2 erratic in exporting color correction

I see that at least one other user is having the same problem with 10.1.2. My movies of four or five clips (auditions for actors) are not carrying color correction forward upon export on all the clips. Some, yes. Some, no. For several hours over two days I have tried everything I can think of to isolate the problem and haven't come up with anything. Sometimes when I export a second time after first disabling and then re-enabling the color correction settings, the second export will be fine.

I've sent in a feedback note to Apple, but I have no reason to believe they'll respond (several times over the years I've done the same on various issues, and have never gotten a response).

While it's distressing that the problem exists on my three iMacs, it's a bit encouraging that I've found someone else having the problem here in the forum.

(Sorry, couldn't find that thread again just now, so I am posting a new question.)

Anyone with any wisdom? Please?

Thanks.